U.S. sets world record of 3:19.40 in mixed 4x100m freestyle relay

Swimmers of the United States celebrates after the mixed 4x100m freestyle relay final at FINA World Championships in Gwangju, South Korea, on July 27, 2019. Team of the United States set a new world record with 3 minutes 19.40 seconds. (Xinhua/Xia Yifang)