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.

Input: Consider Input: Problem: car x began traveling at an average speed of 35 miles per hour. after 72 minutes, car y began traveling at an average speed of 70 miles per hour. when both cars had traveled the same distance, both cars stopped. how many miles did car x travel from the time car y began traveling until both cars stopped ?
Options: a. 15, b. 20, c. 40, d. 42, e. 68

Output: d

Input: Consider Input: Problem: j is faster than p. j and p each walk 24 km. sum ofthe speeds of j and p is 7 kmph. sum of time taken by them is 14 hours. then j speed is equal to ?
Options: a. 4, b. 5, c. 6, d. 7, e. 8

Output: a

Input: Consider Input: Problem: a fruit seller sells mangoes at the rate of rs. 12 per kg and thereby loses 10 %. at what price per kg, he should have sold them to make a profit of 15 % ?
Options: a. rs. 11.81, b. rs. 12, c. rs. 15.33, d. rs. 12.31, e. none
Output: c