A boat takes 9 hours to travel a distance upstream and takes 3 hours to travel the same distance downstream . If the spee of the boat in still water is 4 km/hr , what is the speed of the stream ?
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Let velocity of the stream be x km/h.
Therefore, Velocity of the boat downstream
= (4 + x) km/h
and velocity of the boat upstream
= (4 - x) km/h
According to the question,
3(4+x)=9(4−x)
=> 12+3x=36−9x
=> 12x = 24
Therefore, x =2 km/h
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