A man swims downstream 48 km and upstream 18 km taking 3 hours each time, what is the speed of the man in still water?
Pick one:
A) 2	B) 8	C) 9	D) 11	E) 14
48 --- 3 11S = 16   ? ---- 1   18 ---- 3 US = 6   ? ---- 1 M = ?   M = (16 + 6)/2= 
<gadget id="calculator">(16 + 6)/2</gadget>
<output>11</output>
11   Answer: 11
<result>D</result>
A man swims downstream 48 km and upstream 18 km taking 3 hours each time, what is the speed of the man in still water?