Speed of boat along the river (Downstream) a = u + v
Speed of boat against the river (Upstream) b = u – v
Mostly speed if boat greater than speed of water
Speed of boat in still water u = ½(a + b)
Speed of water current v = ½(a – b)
Distance = time (u2 – v2)/ 2u
u – Speed of boat/man
v – Speed of water
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