A man can row upstream at 20 kmph and downstream at 80 kmph, and then find the speed of the man in still water?
Pick one:	A) 32 kmph	B) 50 kmph	C) 30 kmph	D) 45 kmph	E) 65 kmph
US = 20   DS = 80   M = (20 + 80)/2= 
<gadget id="calculator">(20 + 80)/2</gadget>
<output>50</output>
50   Answer:50 kmph
<result>B</result>
A man can row upstream at 20 kmph and downstream at 80 kmph, and then find the speed of the man in still water?