数学题：今天，小明乘车从家到郊区看望外婆，汽车的速度是48千米/时。己经行驶了3/1小时，距离外婆家还有5千米的路程。小明家到外婆家的路程是多少千米？

数学题解答：思路是先算出已经行的路程，再加上剩下的，就是小明家到外婆家的距离。

48 × 1/3 + 5 = 21（千米）

答：小明家到外婆家的路程是21千米。

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