一辆车从甲地开往乙地,然后又返回甲地,共用了7小时,已知往返的速度比是4:5,往返的时间各是几小时?
一辆车从甲地开往乙地,然后又返回甲地,共用了7小时,已知往返的速度比是4:5,往返的时间各是几小时?
数学人气：563 ℃时间：2020-03-05 03:15:46
优质解答
设去的时间为x,则回来的时间为(7-x).因为路程是一样的,速度比也已知,可得：4*x=5*(7-x),然后算出x=28/9,即为去的时间,回来的再用7减去就行了
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