Q: Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.
Problem: two trains are approaching each other at 60 mph each. the length of each train is 1 / 6 miles. when the two locomotives ( engines ) meet, how many seconds will it take for them to pass each other completely ?
Options: a. 8 sec, b. 11 sec, c. 12 sec, d. 10 sec, e. 15 sec
A:
d