## Discussion Forum

### AMC 10 Mock Exam Discussion For 9/11: Question 12

AMC 10 Mock Exam Question 12

Keiko walks once around a track at exactly the same constant speed every day. The sides of the track are straight, and the ends are semicircles. The track has a width of $6$ meters, and it takes her $36$ seconds longer to walk around the outside edge of the track than around the inside edge. What is Keiko's speed in meters per second?

$\displaystyle\textbf{(A) } \frac{\pi}{3} \qquad\textbf{(B) } \frac{2\pi}{3} \qquad\textbf{(C) } \pi \qquad\textbf{(D) } \frac{4\pi}{3} \qquad\textbf{(E) } \frac{5\pi}{3}$

Submit your answer and solution and explanation below! Solutions will be accepted for 48 hours until 9/13 at 2pm Pacific Time. (There's still time for yesterday's problem too: click here.)

Top solutions for all the Mock Exam questions will be collected and shared as part of a full 25 Question Mock AMC 10 Exam.

Note: The question above is a past AMC problem. Solutions submitted must be written by students. Copied solutions will be disqualified. 