问题
单项选择题
一只船顺流而行的航速为30km/h，已知顺水航行3h和逆水航行5h的航程相等，则此船顺水漂流1h的航程为( )km．
A．(A) 4
B．(B) 6
C．(C) 8
D．(D) 10
答案
参考答案：B
解析： 设水流速度为x，则船在静水中的速度为30-x，根据题意，有30×3=(30-2x)×5
x=6，选(B)．
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一只船顺流而行的航速为30km/h，已知顺水航行3h和逆水航行5h的航程相等，则此船顺水漂流1h的航程为( )km．
A．(A) 4
B．(B) 6
C．(C) 8
D．(D) 10
参考答案：B
解析： 设水流速度为x，则船在静水中的速度为30-x，根据题意，有30×3=(30-2x)×5
x=6，选(B)．
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