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: there are two cars. one is 100 miles north of the other. simultaneously, the car to the north is driven westward at 10 miles per hour and the other car is driven eastward at 15 miles per hour. how many miles apart are the cars after 3 hours ?
Options: a. 125, b. 150, c. 200, d. 225, e. 250
A:
a