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

Input: Consider Input: Problem: one fast typist type some matter in 4 hrs and another slow typist type the same matter in 6 hrs . if both do combine in how much time they will take to finish .

Output: 2 hr 24 mins


Input: Consider Input: Problem: meena wrote all the numbers from 1 to 29,999 inclusive . how many digits did she write in total ?

Output: 138,889


Input: Consider Input: Problem: if a lends rs . 3150 to b at 8 % per annum and b lends the same sum to c at 12.5 % per annum then the gain of b in a period of 2 years is ?


Output: 283.5