AMC 8 2013 Problem 7

Trey and his mom stopped at a railroad crossing to let a train pass. As the train began to pass, Trey counted 6 cars in the first 10 seconds. It took the train 2 minutes and 45 seconds to clear the crossing at a constant speed. Which of the following was the most likely number of cars in the train? $\textbf{(A)}\ 60 \textbf{(B)}\ 80 \textbf{(C)}\ 100 \textbf{(D)}\ 120 \textbf{(E)}\ 140$