数学题：小红上学时坐车，回家步行，在路上一共用了36分钟；如果往返都坐车，全部行程只需10分钟。如果往返都步行，需要多少分钟？

数学题解答：

“如果往返都坐车，全部行程只需10分钟。”说明坐车一趟只需5分钟，10÷2＝5（分钟）

“小红上学时坐车，回家步行，在路上一共用了36分钟”，说明步行一趟只需31分钟，36-5＝31（分钟）

往返都步行，时间再乘2就可以了，是62分钟。31×2＝62（分钟）

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