![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
轮船在静水中的速度为20 km/h,水流速度为4 km/h,从甲码头顺流航行到乙码头,再返回甲码头,共用5小时(不计停留时间),求甲、乙两码头间的距离.设两码头间的距离为x km,则列出的方程正确的是()
A.(20+4)x+(20-4)x=5
B.20x+4x=5
C.x/20+x/4=5
D.x/(20+4)+x/(20-4)=5
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
D、x/(20+4)+x/(20-4)=5
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.(20+4)x+(20-4)x=5
B.20x+4x=5
C.x/20+x/4=5
D.x/(20+4)+x/(20-4)=5
D、x/(20+4)+x/(20-4)=5
A.1/3-1/x=1/x-1/4
B.1/3-1/x=1/4+1/x
C.1/(x+3)=1/4-1/x
D.1/(4-x)=1/x+1/3
A.20
B.30
C.40
D.80
A.15
B.20
C.40
D.45