Xiao Wang walks 4 kilometers per hour, and Xiao Zhang walks 5 kilometers per hour. They travel from A to B. Xiao Li rides a bicycle 10 kilometers per hour from place B to place A. The three of them set off at the same time, and 6 minutes after Xiao Zhang and Xiao Li met, Xiao Wang and Xiao Li met. So, how many hours does it take Xiao Li to ride a bicycle from place B to place A?
小王每小时步行4千米，小张每小时步行5千米，他们从甲到乙．小李每小时骑车10千米，从乙地到甲地．他们3人同时出发，在小张小李相遇后6分钟，小王与小李相遇．那么，小李骑车从乙地到甲地要多少小时？
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