A man can row upstream at 4km/hr and down stream at 10km/hr find mans rate in still water ?
Choose the correct choice from the following answers
A) 4km/hr  B) 5km/hr  C) 5.5km/hr  D) 6km/hr  E) 7km/hr
given upstream(u) =4km/hr   down stream (v)= 10km/hr rate in still water =1/2(u+v)=1/2(4+10)=7km/hr Answer is (7km/hr):7
<result>E</result>
A man can row upstream at 4km/hr and down stream at 10km/hr find mans rate in still water ?