two cars start at the same time but from different starting points,one at an average speed of 100 mph and the other at 1
问题描述：
two cars start at the same time but from different starting points,one at an average speed of 100 mph and the other at 120 mph.if it takes the second car 15 minutes to catch the first one,how long was the head start given from the second to the first?译文：两辆车同时开始,但从不同的起点,一个平均速度为每小时100英里,另以120英里每小时.如果需要第二辆车15分钟赶上第一个,头开始被多长时间从第二到第一?
答
15分钟=1/4小时
（120-100）x1/4=20x1/4=5英里
在我回答的右上角点击【评价】,然后就可以选择【满意,问题已经完美解决】了.说实话 真的看不懂！不过采纳了哦