176/11=16,即水流速为14
176/(30+14)=4
轮船每小时行30千米,在长176千米的河中逆流航行要11小时到达,返回需几小时
轮船每小时行30千米,在长176千米的河中逆流航行要11小时到达,返回需几小时
数学人气：487 ℃时间：2020-04-12 06:23:04
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