搜搜考试网英文数学题☆HELP★~~~~~~~~~~~（还会加分!）
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英文数学题☆HELP★~~~~~~~~~~~（还会加分!）
A ship sails out and home(往返）between places A and B.From A to B,it is fair current,From B to A it is reverse current .if we know the speed of this ship in still water is 20km/h.and it takes this ship 6h to sallfrom A to B,however, from B to A this ship takes 1.5times as long as the time from A to B.Can you know the flowing water speed?
Thank you !
有翻译（+5分）
有过程（+10分）
A ship sails out and home(往返）between places A and B.From A to B,it is fair current,From B to A it is reverse current .if we know the speed of this ship in still water is 20km/h.and it takes this ship 6h to sallfrom A to B,however, from B to A this ship takes 1.5times as long as the time from A to B.Can you know the flowing water speed?
Thank you !
有翻译（+5分）
有过程（+10分）
一辆船往返于A和B之间.从A到B 顺流,从B到A是逆流.如果我们知道他的静水速度是20公里/小时,从A到B需要6小时,但是,从B到A本船舶需要1.5倍的从A到B的时间.你能知道水流速度吗?
上面的人真是瞎搞,随便找个翻译软件.这么简单的问题还给了这么多冗余条件还不会?
速度比等于时间反比：（20+v）：（20-v）=1.5
解得v=4
上面的人真是瞎搞,随便找个翻译软件.这么简单的问题还给了这么多冗余条件还不会?
速度比等于时间反比：（20+v）：（20-v）=1.5
解得v=4