Given the task definition and input, reply with output. 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 train is 360 meter long is running at a speed of 52 km / hour. in what time will it pass a bridge of 140 meter length.
Options: a. 24.62 seconds, b. 34.62 seconds, c. 44.62 seconds, d. 54.62 seconds, e. none of these
b