A man's speed with the current is 15 km/hr and the speed of the current is 2.5 k

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Question: 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:

Options are:

A.     8.5 km/hr
B.     9 km/hr
C.     10 km/hr
D.     12.5 km/hr

Correct answer is:

C.     10 km/hr