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 5 km?  Select:
A) 2.0
B) 2.5
C) 3.0
D) 3.5
E) 4.0
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  5/2= 
<gadget id="calculator"> 5/2</gadget>
<output>5/2 = around 2.5</output>
2.5 hours.   The answer is 2.5.
<result>B</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 5 km?