问题 单项选择题

一只船沿河顺水而行的航速为30千米/小时,已知按同样的航速在该河上顺水航行3小时和逆水航行5小时的航程相等,则此船在该河上顺水漂流半小时的航程为( )

A.1千米

B.2千米

C.3千米

D.4千米

答案

参考答案:C

解析: 设水流速度为x,则根据题意,有以下等式成立:
30×3=(30-2x)×5,解得x=6(千米/小时)
所以船在河上顺水漂流半小时的航程为3千米。

阅读理解

阅读理解。

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