Two ferries start at the same time from opposite sides of a river.Each travels at a constant speed,but one is faster tha
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
How wide is the river
英語人氣:761 ℃時(shí)間:2020-04-19 00:48:40
優(yōu)質(zhì)解答
已知:兩船勻速渡河,其中一船速度快,相遇時(shí)距最近河岸720m;渡河后各停留10min后回返,再次相遇時(shí),距另一河岸400m.求:河寬.假設(shè):起初,A船從河A岸出發(fā),B船從河B岸出發(fā),A船速度V(A)大于B船速度V(B);且河岸寬L.解題過...
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