A man can row downstream at the rate of 30 Kmph and upstream at 10 Kmph. Find the man’s rate in still water and rate of current?  Choose the correct answer.
A) 10
B) 8.0
C) 9.5
D) 9.0
E) 8.25
Rate of still water = 1/2 (down stream + upstream)   = 1/2 (30 + 10) = 20 Kmph   rate of current = 1/2 (down stream - upstream)   = 1/2 (30 - 10)   = 1/2 (20)   = 10 kmph   10nswer is 10.
<result>A</result>
A man can row downstream at the rate of 30 Kmph and upstream at 10 Kmph. Find the man’s rate in still water and rate of current?