A man can row upstream at 3km/hr and down stream at 13km/hr find mans rate in still water ?
Choose the correct choice from the following answers.
A) 2km/hr
B) 4km/hr
C) 6km/hr
D) 8km/hr
E) 10km/hr
:	given upstream(u) =3km/hr   down stream (v)= 13km/hr rate in still water =1/2(u+v)=1/2(3+13)=8km/hr Answer is (8km/hr):8
<result>D</result>
A man can row upstream at 3km/hr and down stream at 13km/hr find mans rate in still water ?