A man can row at 5 km/hr in still water and the velocity of current is 1 km/hr. It takes him 1 hour to row to a place and back. How far is the place.
ক. 2.5
খ. 2.4
গ. 3
ঘ. 3.6
উত্তর: 2.4
ব্যাখ্যা: Speed downstream = (5+1) km/hr = 6 km/hr. Speed upstream = (5 -1) = km/hr = 4 km/hr. Let the required distánce be x km. Then, [গণিত] or [গণিত]
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