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A boat goes 6 km an hour in still water,...

A boat goes 6 km an hour in still water, it takes thrice as much time in going the same distance against the current in comparison to direction of current The speed of the current (in km/hour) is

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Speed of boat in still water=6km/hour.
Now when it goes against stream of water its speed is`(6-x)`km/hr
now `(6-x)3=6`
=>`3x=12`
x=4km/hour =speed of current.
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