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: one fast typist type some matter in 4 hrs and another slow typist type the same matter in 6 hrs. if both do combine in how much time they will take to finish.
Options: a. 10 hr, b. 1 hr, c. 2 hr 24 mins, d. 3 hr 4 mins, e. 4 hr 10 mins
Solution:
c