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 8km?  Choose the correct answer:  A) 4  B) 7  C) 5  D) 9  E) 6
M = 12   S = 10   US = 12 - 10= 
<gadget id="calculator">12 - 10</gadget>
<output>2</output>
2   D= 8   T = 8/2= 
<gadget id="calculator">8/2</gadget>
<output>4</output>
4   4nswer: 4
<result>A</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 8km?