The task is to generate the correct answer for a given math problem.

Ex Input:
Problem: a hiker walking at a constant rate of 4 kilometers per hour is passed by a cyclist travelling in the same direction along the same path at a constant rate of 24 kilometers per hour . the cyclist stops and waits for the hiker 5 minutes after passing her while the hiker continues to walk at her constant rate . how many minutes must the cyclist wait until the hiker catches up ?

Ex Output:
25


Ex Input:
Problem: a can do a work in 15 days and b in 20 days . if they work on it together for 7 days , then the fraction of the work that is left is

Ex Output:
11 / 6


Ex Input:
Problem: a number x is mistakenly divided by 10 instead of being multiplied by 10 . what is the percentage error in the result ?

Ex Output:

- 99 %