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
Solution
Correct Answer: Option C
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.