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: two cyclist start from the same places in opposite directions. one is going towards north at 30 kmph and the other is going towards south 40 kmph. what time will they take to be 50 km apart ?
Options: a. 1.32 hr, b. 0.714 hrs, c. 3.231 hrs, d. 0.515 hrs, e. 6.214 hrs
A:
b