A man swims downstream 36 km and upstream 18 km taking 6 hours each time, what is the speed of the man in still water? Pick one.
A) 4.5  B) 5.5  C) 6.5  D) 4.8  E) 2
36 --- 6 DS = 6   ? ---- 1   18 ---- 6 US = 3   ? ---- 1 M = ?   M = (6 + 3)/2= 
<gadget id="calculator">(6 + 3)/2</gadget>
<output>9/2 = around 4.5</output>
4.5   4.5nswer: 4.5
<result>A</result>
A man swims downstream 36 km and upstream 18 km taking 6 hours each time, what is the speed of the man in still water?