A rower can row upstream at 7 km/hr and downstream at 12 km/hr. What is the rower's rate in still water?	Choose the correct choice from the following answers.
A) 8.0 km/hr B) 8.5 km/hr C) 9.0 km/hr D) 9.5 km/hr E) 10 km/hr
The rate in still water is 1/2 * (12 + 7)= 
<gadget id="calculator">1/2 * (12 + 7)</gadget>
<output>19/2 = around 9.5</output>
9.5 km/hr   The answer is 9.5 km/hr.
<result>D</result>
A rower can row upstream at 7 km/hr and downstream at 12 km/hr. What is the rower's rate in still water?