A man can row upstream at 25 kmph and downstream at 55 kmph, and then find the speed of the man in still water? Choose the correct choice from the following:
A) 65
B) 40
C) 30
D) 78
E) 38
US = 25   DS = 55   M = (55 + 25)/2= 
<gadget id="calculator">(55 + 25)/2</gadget>
<output>40</output>
40   Answer: 40
<result>B</result>
A man can row upstream at 25 kmph and downstream at 55 kmph, and then find the speed of the man in still water?