A person can swim in still water at 4 km/h. If the speed of water 2 km/h, how many hours will the man take to swim back against the current for 6km?
Answers:
A) 5
B) 7
C) 3
D) 1/2
E) 4
Explanation:   M = 4   S = 2   US = 4 - 2= 
<gadget id="calculator">4 - 2</gadget>
<output>2</output>
2   D= 6   T = 6/2= 
<gadget id="calculator">6/2</gadget>
<output>3</output>
3   Answer: 3
<result>C</result>
A person can swim in still water at 4 km/h. If the speed of water 2 km/h, how many hours will the man take to swim back against the current for 6km?