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: by investing in 1623 % stock at 64 , one earns rs . 1500 . the investment made is

Output: rs . 5760


Input: Consider Input: Problem: if a tire rotates at 400 revolutions per minute when the car is traveling 24 km / h , what is the circumference of the tire ?


Output: 1 meters