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

Example Input: Problem: a cat chases a rat 6 hours after the rat runs . cat takes 4 hours to reach the rat . if the average speed of the cat is 90 kmph , what s the average speed of the rat ?
Example Output: 36 kmph

Example Input: Problem: the average of 10 numbers is 0 . in those 10 , at the least , how many may be greater than or equal to zero ?
Example Output: 1

Example Input: Problem: jack , jill , and sandy each have one try to make a basket from half court . if their individual probabilities of making the basket are 1 / 6 , 1 / 7 , and 1 / 8 respectively , what is the probability that jill and sandy will make a basket but jack will miss ?
Example Output:
5 / 336