If the speed of a boat in still water is 20 km/hr and the speed of the current is 5 km/hr, then the time taken by the boat to travel 100 km with the current is
Speed of boat = 20 km/hr and speed of current = 5 km/hr
Distance to travel = 100 km
Speed downstream (with the current) = 20 + 5 = 25 km/hr
=> Time taken = distance / speed
= $$\frac{100}{25}=4$$ hours
=> Ans - (C)
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