Two ferries start at the same time from opposite sides of a river.Each travels at a constant speed,but one is faster tha
问题描述：
Two ferries start at the same time from opposite sides of a river.Each travels at a constant speed,but one is faster than the other .They pass at a point 720m from the nearest shore.Both boat wait ten minutes before going back.On the return trip they meet 400m from the other shore .
How wide is the river
答
已知：两船匀速渡河,其中一船速度快,相遇时距最近河岸720m；渡河后各停留10min后回返,再次相遇时,距另一河岸400m.求：河宽.假设：起初,A船从河A岸出发,B船从河B岸出发,A船速度V(A)大于B船速度V(B)；且河岸宽L.解题过...