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 travelling in the same direction at 50 and 40 kmph completely pass off another in 1 1 / 2 minute. if the length of the first train is 125 m, what is the length of the second train ?
Options: a. 300 m, b. 287 m, c. 125 m, d. 250 m, e. 167 m
c