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A speed of boat in stillwater is 10 kilometre per hour if the boat goes 37.5 kilometre upstream in 5 hours find the speed of the stream




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Let the speed of stream be s km/h
distance = speed×time
in case of upstream, speed = (37.5 -s)km/h
⇒10 = (37.5 -s)×5
(37.5 -s)=2
⇒speed of stream, s = 37.5 -2 = 35.5 km/h 
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Speed upstream is 37.5/5= 7.5
speed of stream = speed in still water- speed upstream
10-7.5=2.5 kmph
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