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

Example Input: Problem: a and b are 90 km apart they start to move each other simultaneously a at speed 10 and b at 5 km / hr if every hour they double their speed what is distance that a pass until he meet b ?
Example Output: 60 km

Example Input: Problem: what is the remainder when 1201 1202 1205 1207 is divided by 6 ?
Example Output: 4

Example Input: Problem: if the simple interest on a certain sum of money for 2 years is one fifth of the sum , then the rate of interest per annum is
Example Output:
10 %