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

Input: Consider Input: Problem: two pipes can fill the cistern in 10 hr and 12 hr respectively , while the third empty it in 30 hr . if all pipes are opened simultaneously , then the cistern will be filled in

Output: 6.67 hr


Input: Consider Input: Problem: from a pack of cards , two cards are drawn one after the other , with replacement . what is the probability that the first card is a black card and the second card is a king ?

Output: 1 / 26


Input: Consider Input: Problem: if m is a positive integer and m ^ 2 is divisible by 24 , then the largest positive integer that must divide m is ?


Output: 8