数学题：两辆车同时从A地开往B地。5时后它们同时到达B地。汽车在途中停了一小时，客车速度比汽车慢。A地到B地共长400千米。汽车每时比客车快多少千米？

数学题解答：

客车中途没有停，它行400千米一共用了5小时。它的速度是：

400÷５＝80(千米)

汽车中途停了一小时，它用的时间是：5-1=4（小时）

汽车的速度是：

400÷４＝100(千米)

汽车每小时比客车快：

100-80=20（千米）

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