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: a 300 m long train crosses a platform in 48 sec while it crosses a signal pole in 18 sec. what is the length of the platform ?
Options: a. 500, b. 350, c. 828, d. 277, e. 122
A:
a