A swimmer can swim in still water at 4 km/h. If the speed of the water current is 2 km/h, how many hours will the swimmer take to swim against the current for 3 km?	Select the correct option.
A) 1.5	B) 1.75	C) 2.0	D) 2.25	E) 2.5

Rationale: "the swimmer can swim against the current at a speed of 4 - 2 = 2 km / h . the time it will take is 3 / 2 = 1.5 hours . the answer is a ."
Answer: A