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 Choose the correct answer:
A) 8.5 km / hr B) 9 km / hr C) 10 km / hr D) 12.5 km / hr E) none

Rationale: sol . man ' s rate in still in 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 . answer c
Answer: C