Question
The speed of a boat in still water is 6 km/hr and speed
of current is 3 km/hr. If time taken to cover a certain distance upstream is 21 hours, then how long will the boat take to cover the same distance downstream?Solution
Total distance = 21 × (6 – 3) = 63 km Required time = 63/(6 + 3) = 7 hrs
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