Question
A launch goes 120 km with the current in 6 hours. For the
same trip against the current, it needs 4 hours more. What’s the speed of the boat in still water?Solution
ATQ,
Downstream speed = 120 / 6 = 20
Upstream speed = 120 / 10 = 12
V + U = 20
V – U = 12
By solving, we get V = (20 + 12) / 2 = 16 km/hr
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