Question
The speed of a boat in still water is 5 km/hr and speed of current is 2 km/hr. If time taken to cover a certain distance upstream is 14 hours, then how long will the boat take to cover the same distance downstream?
Solution
Speed upstream = 5 - 2 = 3 km/hr Total distance covered = 14 × 3 = 42 km Speed downstream = 5 + 2 = 7 km/hr Required time = 42/(5 + 2) = 6 hrs
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