A man rows downstream at 20 km/hr and rows upstream at 15 km/hr. At what speed he can row in still water?
Speed of stream =$\dfrac{1}{2}\left(Downstream\:Speed+Upstream\:Speed\right)$
Speed downstream = 20 km/hr
Speed upstream = 15 km/hr
Required speed =$\dfrac{1}{2}\left(20+15\right)km/hr$
=$\dfrac{1}{2}\times 35$
=17.5km/hr
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