A man can row upstream at 7kmph and downstream at 10kmph. Find man's rate in still water ?  Choose the most appropriate option
A) 8.5km/hr
B) 6.7km/hr
C) 5km/hr
D) 1.5km/hr
E) 2.6km/hr
Rate in still water = 1/2 (10+7) = 8.5km/hr   8.5km/hrnswer is 8.5km/hr
<result>A</result>
A man can row upstream at 7kmph and downstream at 10kmph. Find man's rate in still water ?