A man swims downstream 65 km and upstream 35 km taking 5 hours each time; what is the speed of the current?
Select
A) 2
B) 3
C) 5
D) 7
E) 9
65 --- 5 DS = 13   ? ---- 1   35 ---- 5 US = 7   ? ---- 1 S = ?   S = (13 - 7)/2= 
<gadget id="calculator">(13 - 7)/2</gadget>
<output>3</output>
3   Answer: 3
<result>B</result>
A man swims downstream 65 km and upstream 35 km taking 5 hours each time; what is the speed of the current?