A man swims downstream 45 km and upstream 25 km taking 5 hours each time, what is the speed of the man in still water?
Choose the correct choice from the following answers:
A) 17
B) 24
C) 7
D) 24
E) 20
45--- 5 DS = 9   ? ---- 1   25 --- 5 US = 5   ? ---- 1 M = ?   M = (9+ 5)/2 = 14/2= 
<gadget id="calculator">14/2</gadget>
<output>7</output>
7   Answer: 7
<result>C</result>
A man swims downstream 45 km and upstream 25 km taking 5 hours each time, what is the speed of the man in still water?