A rower can row upstream at 7 km/hr and downstream at 14 km/hr. What is the rower's rate in still water?
Choose the correct choice from the following options:
A) 9.5 km/hr
B) 10.0 km/hr
C) 10.5 km/hr
D) 11.0 km/hr
E) 11.5 km/hr
The rate in still water is 1/2 * (14 + 7)= 
<gadget id="calculator">1/2 * (14 + 7)</gadget>
<output>21/2 = around 10.5</output>
10.5 km/hr   The answer is 10.5 km/hr.
<result>C</result>
A rower can row upstream at 7 km/hr and downstream at 14 km/hr. What is the rower's rate in still water?