If a boat's speed in the still water is 5m/s,and the speed of water in a river is 3m/s.How can
问题描述：
If a boat's speed in the still water is 5m/s,and the speed of water in a river is 3m/s.How can
继续.we cross the river in the shortest time?And how about the shortest distance?Draw the diagrams.
答
是翻译还是要画图呢?画图姐姐不擅长了
如果船在静水的速度是5米/秒,水速是3米/秒,怎样用最短时间过河?又怎样行走最短的距离,画图额...是画图...