A man swims downstream 36 km and upstream 26 km taking 2 hours each time, what is the speed of the man in still water? Pick:  A) 9  B) 18.4  C) 15.5  D) 16.7  E) 13.4
36 --- 2 DS = 18   ? ---- 1   26 ---- 2 US = 13   ? ---- 1 M = ?   M = (18 + 13)/2= 
<gadget id="calculator">(18 + 13)/2</gadget>
<output>31/2 = around 15.5</output>
15.5   Answer: 15.5
<result>C</result>
A man swims downstream 36 km and upstream 26 km taking 2 hours each time, what is the speed of the man in still water?