Stephen likes to bike after school, and he has to get home before dark, so he only bike for five hours. His favorite route is a 45 mile loop starting from his house. In the first hour, he travels nine miles. For the next two hours, he travels at 7 miles per hour. Compute the average speed Stephen has to ride for the last three hours to get home before dark.  Answers:
A) 10	B) 11	C) 12	D) 13	E) 14
Stephen has to travel (45 - 9 - 7 * 2)= 
<gadget id="calculator">(45 - 9 - 7 * 2)</gadget>
<output>22</output>
22 miles in 2 hours   22 miles / 2 hours= 11 miles per hour   Correct answer 11
<result>B</result>
Stephen likes to bike after school, and he has to get home before dark, so he only bike for five hours. His favorite route is a 45 mile loop starting from his house. In the first hour, he travels nine miles. For the next two hours, he travels at 7 miles per hour. Compute the average speed Stephen has to ride for the last three hours to get home before dark.