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 8 km?
Select.
A) 1
B) 2
C) 3
D) 4
E) 5
The swimmer can swim against the current at a speed of 4-2= 
<gadget id="calculator">4-2</gadget>
<output>2</output>
2 km/h.   The time it will take is  8/2= 
<gadget id="calculator"> 8/2</gadget>
<output>4</output>
4 hours.   The answer is 4.
<result>D</result>
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 8 km?