A man rows a boat at a speed of 5km/hr in still water. Find the speed of a river if it takes him 1 hour
to row a boat to a place 2.4 km away and return back.
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Speed of man's boat in still water = 5 kmph.
Effective speed of man's boat when rowing upstream = (5-1) kmph = 4 kmph.
Total time taken is 75 minutes i.e. 1 hour 15 minutes.
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