Detailed Instructions: 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.
Q: Problem: train a leaves the station traveling at 30 miles per hour. two hours later train leaves the same station traveling in the same direction at 45 miles per hour. how many miles from the station was train a overtaken by train b ?
Options: a. 100, b. 120, c. 140, d. 160, e. 180
A:
e