Calculate how long it will take a swimmer to swim a distance of 12km against the current of a river which flows at 1.2 km/hr, given that he can swim in still water at 5km/h
Choose the correct choice from the following options:
A) 3.26 B) 3.16 C) 2.34 D) 3.98 E) 3.17

Rationale: "swim in still water at = 5 speed of river = 1.2 us = 5 - 1.2 = 3.8 distance = 12 t = 12 / 3.8 = 3.16 answer : b"
Answer: B