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Boats and Streams - General Aptitude

Q1:

A man's speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is:

A 8.5 km/hr

B 9 km/hr

C 10 km/hr

D 12.5 km/hr

ANS:C - 10 km/hr

Man's rate in still water = (15 - 2.5) km/hr = 12.5 km/hr. Man's rate against the current = (12.5 - 2.5) km/hr = 10 km/hr.