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.
Problem:Problem: a train 250 m long, running with a speed of 50 km / hr will pass a tree in ?
Options: a. 18 sec, b. 20 sec, c. 25 sec, d. 30 sec, e. 1 min
Solution:
a