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 12km?
Choices.
A) 3
B) 5
C) 8
D) 9
E) 6
M = 4   S = 2   US = 4 - 2= 
<gadget id="calculator">4 - 2</gadget>
<output>2</output>
2   D= 12   T = 12/2= 
<gadget id="calculator">12/2</gadget>
<output>6</output>
6   Answer:6
<result>E</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 12km?