A rower can row upstream at 15 kph and downstream at 30 kph. What is the speed of the rower in still water?	Choose the correct choice from the following answers
A) 20.9 B) 21.3 C) 21.7 D) 22.1 E) 22.5
Let V be the rower's speed in still water.   Let S be the speed of the current in the stream   V-S = 15   V+S = 30   When we add the two equations, we get: 2V = 45   Then V = 22.5 kph.   The answer is 22.5.
<result>E</result>
A rower can row upstream at 15 kph and downstream at 30 kph. What is the speed of the rower in still water?