A person can swim in still water at 20 km/h. If the speed of water 12 km/h, how many hours will the man take to swim back against the current for 40km?	Select the correct option: A) 3 B) 4 C) 5 D) 6 E) 7
M = 20   S = 12   US = 20 - 12= 
<gadget id="calculator">20 - 12</gadget>
<output>8</output>
8   D= 40   T = 40/8= 
<gadget id="calculator">40/8</gadget>
<output>5</output>
5 Answer:5
<result>C</result>
A person can swim in still water at 20 km/h. If the speed of water 12 km/h, how many hours will the man take to swim back against the current for 40km?