A man swims downstream 120 km and upstream 50 km taking 5 hours each time; what is the speed of the current?
Choose the correct choice from the following answers:  A) 3 kmph  B) 7 kmph  C) 13 kmph  D) 6.5 kmph  E) 7:3kmph
Explanation:   120 --- 5 DS = 24   ? ---- 1   50 ---- 5 US = 10   ? ---- 1 S = ?   S = (24 - 10)/2= 
<gadget id="calculator">(24 - 10)/2</gadget>
<output>7</output>
7   Answer: Option 7 kmph
<result>B</result>
A man swims downstream 120 km and upstream 50 km taking 5 hours each time; what is the speed of the current?