A man can row with the stream at 7 km/hr and against the stream at 3 km/hr. His speed in still water is:
Speed of the man upstream = 7 km/hr.
Speed of the man downstream = 3 km/hr.
Speed of the man in still water = 1/2 (Downstream Speed + Upstream Speed) = (1/2) (7 + 3) = 5 km/hr.
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