A rower can row upstream at 15 kph and downstream at 35 kph. What is the speed of the rower in still water? Choose the correct option:
A) 22  B) 23  C) 24  D) 25  E) 26
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 = 35   When we add the two equations, we get: 2V = 50   Then V = 25 kph.   The answer is 25.
<result>D</result>
A rower can row upstream at 15 kph and downstream at 35 kph. What is the speed of the rower in still water?