A man can row upstream at 5kmph and downstream at 15kmph. Find man's rate in still water ? Choose the most appropriate option.
A) 5km/hr	B) 15km/hr	C) 10km/hr	D) 20km/hr	E) 7.5km/hr
Rate in still water = 1/2 (5+15) = 10km/hr   Answer is 10km/hr
<result>C</result>
A man can row upstream at 5kmph and downstream at 15kmph. Find man's rate in still water ?