| Final 21:49 | time | gap | L | pts | _______ | | Final 21:56 | time | gap | L | pts | _______ | 1. | China | 3:38.57 | | 6 | 986 | | | Jiayu Xu 52.42s M, Haiyang Qin 1:49.73 M, Yufei Zhang 2:45.42 F, Yujie Cheng 3:38 F.57 | 2. | Australia | 3:39.03 | +0.46s | 5 | 980 | | | Kaylee Mckeown 58.03s F, Zac Stubblety-Cook 1:56.87 M, Matthew Temple 2:47.50 M, Shayna Jack 3:39.03 F | 3. | United States | 3:40.19 | +1.62s | 4 | 964 | | | Ryan Murphy 52.02s M, Nic Fink 1:50.21 M, Torri Huske F 2:48.40, Kate Douglass F 3:40.19 | 4. | Netherlands | 3:41.81 | +3.24s | 3 | 943 | | | Maaike De Waard 1:00.05 F, Arno Kamminga 1:59.05 M, Nyls Korstanje 2:49.72 M, Marrit Steenbergen 3:41.81 F | 5. | Great Britain | 3:43.20 | +4.63s | 2 | 926 | | | Medi Eira Harris 59.76s W, James Wilby 1:59.23 M, Jacob Thomas Taylor Peters 2:50.34 M, Anna Hopkin 3:43.20 F | 6. | Canada | 3:43.72 | +5.15s | 7 | 919 | | | Kylie Masse 59.19s W, James Dergousoff 1:59.88 M, Margaret MacNeil 2:56.18 F, Ruslan Gaziev 3:43.72 M | 7. | Japan | 3:45.33 | +6.76s | 1 | 900 | | | Ryosuke Irie 53.42s M, Ippei Watanabe 1:53.02 M, Ai Soma 2:51.42 F, Rikako Ikee 3:45.33 F | 8. | Germany | 3:45.62 | +7.05s | 8 | 896 | | | Ole Braunschweig 54.00s M, Lucas Matzerath 1:53.97 M, Angelina Kohler 2:50.71 F, Nele Schulze 3:45.62 F |
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Heats - Wednesday 26th, July 11:59 | Best 8 times advanced to Final. |
| Heat 5 12:26 | time | gap | L | pts | _______ | 1. | United States | 3:40.47 | | 4 | 961 | 1. | | Katharine Berkoff 59.12s, Josh Matheny 1:57.57, Dare Rose 2:48.07, Abbey Weitzeil 3:40.47 | 2. | Netherlands | 3:41.45 | +0.98s | 5 | 948 | 3. | | Maaike De Waard 1:00.07s, Arno Kamminga 1:58.79, Nyls Korstanje 2:49.32, Marrit Steenbergen 3:41.45 | 3. | Canada | 3:44.32 | +3.85s | 6 | 912 | 6. | | Ingrid Wilm 59.68s, James Dergousoff 1:59.92, Margaret Macneil 2:56.66, Ruslan Gaziev 3:44.32 | 4. | France | 3:46.07 | +5.60s | 7 | 891 | 10. | | Pauline Mahieu 1:00.45, Clement Bidard 2:00.56, Stanislas Huille 2:52.25, Beryl Gastaldello 3:46.07 | 5. | Italy | 3:46.08 | +5.61s | 3 | 891 | 11. | | Lorenzo Mora 54.69s, Federico Poggio 1:53.56, Ilaria Bianchi 2:51.95, Costanza Cocconcelli 3:46.08 | 6. | Poland | 3:46.29 | +5.82s | 2 | 888 | 12. | | Ksawery Masiuk 53.88s, Dominika Sztandera 2:00.49, Adrian Jaskiewicz 2:51.84, Kornelia Fiedkiewicz 3:46.29 | 7. | Brazil | 3:48.00 | +7.53s | 1 | 869 | 16. | | Guilherme Basseto 54.28s, Jhennifer Conceicao 2:02.35, Kayky Mota 2:53.86, Stephanie Balduccini 3:48.00 | 8. | Estonia | 3:53.50 | +13.03s | 9 | 809 | 19. | | Armin Evert Lelle 57.16s, Eneli Jefimova 2:03.99, Daniel Zaitsev 2:56.60, Aleksa Gold 3:53.50 | 9. | Colombia | 3:57.47 | +17.00s | 0 | 769 | 22. | | Santiago Corredor 57.59s, Jorge Murillo Valdes 1:59.00, Karen Durango 3:00.89, Sirena Carolina Rowe Cervantes 3:57.47 | -. | Singapore | DNS | - | 8 | - | |
| Heat 4 12:20 | time | gap | L | pts | _______ | 1. | Australia | 3:40.87 | +0.40s | 4 | 955 | 2. | | Bradley Woodward 53.63s, Sam Williamson 1:52.51, Emma Mckeon 2:49.21, Shayna Jack 3:40.87 | 2. | China | 3:42.49 | +2.02s | 3 | 935 | 4. | | Jiayu Xu 52.68s, Zibei Yan 1:51.68, Yichun Wang 2:49.14, Qingfeng Wu 3:42.49 | 3. | Great Britain | 3:43.47 | +3.00s | 5 | 922 | 5. | | Medi Eira Harris 59.71s, James Wilby 1:59.05, Jacob Thomas Taylor Peters 2:50.08, Anna Hopkin 3:43.47 | 4. | Japan | 3:44.79 | +4.32s | 6 | 906 | 7. | | Ryosuke Irie 53.63s, Ippei Watanabe 1:53.11, Ai Soma 2:50.84, Rikako Ikee 3:44.79 | 5. | Germany | 3:45.34 | +4.87s | 2 | 900 | 8. | | Ole Braunschweig 53.66s, Lucas Matzerath 1:52.63, Angelina Kohler 2:49.28, Lisa-Marie Finger 3:45.34 | 6. | Sweden | 3:45.85 | +5.38s | 8 | 894 | 9. | | Hanna Rosvall 1:00.37, Erik Persson 2:00.49, Louise Hansson 2:57.54, Bjoern Seeliger 3:45.85 | 7. | Greece | 3:47.57 | +7.10s | 7 | 874 | 14. | | Apostolos Christou 52.99s, Arkadios Aspougalis 1:54.29, Anna Ntountounaki 2:51.69, Maria Thaleia Drasidou 3:47.57 | 8. | Israel | 3:47.76 | +7.29s | 1 | 871 | 15. | | Anastasia Gorbenko 1:00.13, Ron Polonsky 2:00.30, Tomer Frankel 2:52.45, Daria Golovaty 3:47.76 | 9. | Hungary | 3:56.82 | +16.35s | 0 | 775 | 21. | | Aron Szekely 55.96s, Dalma Sebestyen 2:05.71, Lora Fanni Komoroczy 3:06.57, Daniel Meszaros 3:56.82 | 10. | Thailand | 4:05.03 | +24.56s | 9 | 700 | 26. | | Saovanee Boonamphai 1:06.29, Dulyawat Kaewsriyong 2:11.79, Navaphat Wongcharoen 3:06.64, Kamonchanok Kwanmuang 4:05.03 |
| Heat 3 12:11 | time | gap | L | pts | _______ | 1. | South Korea | 3:47.09 | +6.62s | 5 | 879 | 13. | | Eunji LEE 1:00.41, Dongyeol Choi 1:59.91, Youngbeom Kim 2:52.16, Yeonkyung HUR 3:47.09 | 2. | New Zealand | 3:49.26 | +8.79s | 3 | 854 | 17. | | Helena Gasson 1:00.68, Josh Gilbert 2:01.71, Vanessa Hazel Ouwehand 3:00.78, Carter Swift 3:49.26 | 3. | Slovakia | 4:01.69 | +21.22s | 4 | 729 | 23. | | Teresa Ivan 1:03.44, Frantisek Jablcnik 2:09.65, Andrea Podmanikova 3:11.76, Matej Dusa 4:01.69 | 4. | Bahamas | 4:03.98 | +23.51s | 7 | 709 | 24. | | Lamar Taylor 55.03s, Rhanishka Gibbs 2:10.45, Davante Carey 3:05.25, Zaylie Elizabeth Thompson 4:03.98 | 5. | Peru | 4:05.00 | +24.53s | 6 | 700 | 25. | | Alexia Sotomayor 1:05.21, McKenna De Bever 2:19.57, Diego Nicolas Balbi Alayo 3:13.75, Joaquin Vargas 4:05.00 | 6. | SMF | 4:15.36 | +34.89s | 1 | 618 | 30. | | Swaleh Abubakar Talib 1:06.03, Maria Brunlehner 2:19.86, Emily Muteti 3:22.57, Monyo Maina 4:15.36 | 7. | Uganda | 4:19.70 | +39.23s | 8 | 588 | 31. | | Adnan Kabuye 1:03.60, Tendo Mukalazi 2:11.00, Tara Ann Mary Naluwoza 3:20.31, Kirabo Namutebi 4:19.70 | 8. | Angola | 4:21.15 | +40.68s | 0 | 578 | 32. | | Salvador Gordo 1:01.31, Maria Lopes Freitas 2:21.52, Lia Ana Lima 3:28.88, Henrique Mascarenhas 4:21.15 | 9. | Northern Marianas | 4:31.93 | +51.46s | 9 | 512 | 35. | | Isaiah Aleksenko 58.58s, Maria Corazon Ayson Batallones 2:19.73, Anthony Deleon Guerrero 3:23.15, Shoko Litulumar 4:31.93 | -. | Spain | DNS | - | 2 | - | |
| Heat 2 12:05 | time | gap | L | pts | _______ | 1. | Armenia | 4:09.83 | +29.36s | 1 | 660 | 28. | | Artur Barseghyan 1:02.72, Ashot Chakhoyan 2:08.17, Varsenik Manucharyan 3:11.19, Ani Poghosyan 4:09.83 | 2. | Bahrain | 4:24.40 | +43.93s | 2 | 557 | 33. | | Asma Lefalher 1:13.55, Abdulla Khaled 2:19.66, Ali Sadeq Alawi 3:20.41, Ayah Binrajab 4:24.40 | 3. | Nigeria | 4:28.90 | +48.43s | 7 | 529 | 34. | | Clinton Opute 1:07.38, Adaku Nwandu 2:30.54, Dorcas Abeng 3:27.64, Colins Obi Ebingha 4:28.90 | 4. | Papua New Guinea | 4:32.31 | +51.84s | 9 | 510 | 36. | | Abigail Ai Tom 1:15.56, Georgia-Leigh Vele 2:32.97, Nathaniel Noka 3:36.85, Josh Tarere 4:32.31 | 5. | FS Micronesia | 4:36.96 | +56.49s | 8 | 484 | 37. | | Kyler Anthony Kihleng 1:12.03, Tasi Limtiaco 2:16.20, Kestra Kihleng 3:30.29, Taeyanna Adams 4:36.96 | 6. | Cabo Verde | 4:37.11 | +56.64s | 0 | 484 | 38. | | La Troya Pina 1:16.55, Jayla Pina 2:30.83, Troy Pina 3:37.65, Ailton Lima 4:37.11 | 7. | Tanzania | 4:37.35 | +56.88s | 3 | 482 | 39. | | Ria Save 1:16.14, Hilal Hilal 2:32.05, Collins Saliboko 3:31.02, Sophia Latiff 4:37.35 | 8. | Guam | 4:40.68 | +1:00.21 | 4 | 465 | 41. | | Israel Poppe 1:03.93, Amaya Bollinger 2:41.93, James Hendrix 3:39.51, Mia LEE 4:40.68 | 9. | Maldives | 4:50.64 | +1:10.17 | 5 | 419 | 42. | | Ali Imaan 1:05.47, Hamna Ahmed 2:36.57, Mohamed Rihan Shiham 3:40.50, Meral Ayn Latheef 4:50.64 | -. | Malawi | DSQ | - | 6 | - | | | Ammara Pinto 1:19.09, Filipe Gomes 2:26.50, Muhammad Ali Moosa 3:42.08, Tayamika Chang'anamuno 4:48.60 |
| Heat 1 11:59 | time | gap | L | pts | _______ | 1. | Mexico | 3:53.38 | +12.91s | 4 | 810 | 18. | | Miranda Grana Perez 1:03.11, Miguel Alejandro De Lara Ojeda 2:04.05, Athena Meneses Kovacs 3:04.80, Andres Dupont Cabrera 3:53.38 | 2. | Belgium | 3:54.06 | +13.59s | 2 | 803 | 20. | | Stan Franckx 56.25s, Florine Gaspard 2:05.05, Valentine Dumont 3:04.72, Lucas Pierre A Henveaux 3:54.06 | 3. | Panama | 4:07.08 | +26.61s | 7 | 682 | 27. | | Carolina Cermelli 1:04.75, Emily Emily Santos 2:15.43, Jeancarlo Calderon Harper 3:12.38, Bernhard Tyler Christianson 4:07.08 | 4. | Mongolia | 4:10.45 | +29.98s | 6 | 655 | 29. | | Ariuntamir Enkh-Amgalan 1:08.41, Enkhtamir Batbayar 2:15.28, Erkhes Enkhtur 3:13.43, Enkhkhuslen Batbayar 4:10.45 | 5. | Tonga | 4:39.42 | +58.95s | 3 | 472 | 40. | | Kapeli Siua 1:10.09, Noelani Malia Day 2:35.22, Finau Ohuafi 3:35.51, Charissa Panuve 4:39.42 | -. | Antigua | DNS | - | 5 | - | |
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