A person can swim in still water at 12 km/h. If the speed of water 10 km/h, how many hours will the man take to swim back against the current for 12km?  Choose the correct choice from the following options:
A) 3  B) 4  C) 5  D) 6  E) 7
M = 12   S = 10   US = 12 - 10= 
<gadget id="calculator">12 - 10</gadget>
<output>2</output>
2   6= 12   T = 12/2= 
<gadget id="calculator">12/2</gadget>
<output>6</output>
6 Answer:6
<result>D</result>
A person can swim in still water at 12 km/h. If the speed of water 10 km/h, how many hours will the man take to swim back against the current for 12km?