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? Choose the correct choice from the following options:
A) 3 B) 6 C) 8 D) 7 E) 9
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   3nswer: 3
<result>A</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?