MathDB
2013/8/7/Cars of a train

Source:

November 27, 2013
AMC 8AMC

Problem Statement

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?
<spanclass=latexbold>(A)</span> 60<spanclass=latexbold>(B)</span> 80<spanclass=latexbold>(C)</span> 100<spanclass=latexbold>(D)</span> 120<spanclass=latexbold>(E)</span> 140<span class='latex-bold'>(A)</span>\ 60 \qquad <span class='latex-bold'>(B)</span>\ 80 \qquad <span class='latex-bold'>(C)</span>\ 100 \qquad <span class='latex-bold'>(D)</span>\ 120 \qquad <span class='latex-bold'>(E)</span>\ 140