Question
To go 75 km downstream, a boat takes 5 hours. For the
same 75 km upstream, it takes 10 hours more than that. What is the boat’s still-water speed?Solution
ATQ,
Downstream speed = 75 / 5 = 15
Upstream speed = 75 / 15 = 5
V + U = 15
V – U = 5
By solving, we get V = (15 + 5) / 2 = 10 km/hr
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