Calculate how long it will take a swimmer to swim a distance of 7km against the current of a river which flows at 2.5km/hr, given that he can swim in still water at 4.4km/h
Choose the correct choice from the following answers.
A) 6.67
B) 1.67
C) 2.67
D) 3.67
E) 4.67

Rationale: "swim in still water at = 4.4 speed of river = 2.5 us = 4.4 - 2.5 = 1.9 distance = 7 t = 7 / 1.9 = 3.67 answer : d"
Answer: D