!!!!!Riddle3!!!!!

A magician was boasting one 日 about how long he could hold his breathe under water.His record was six minutes.A kid that was listening said"thats nothing,I can stay under water for ten 分钟 without using any equipment 或者 air pockets.The magician told him if he could do that, he would give him $10,000.The kid did it and won the money.Can 你 figure out how?