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

Example Input: Problem: two trains of equal length , running with the speeds of 60 and 90 kmph , take 50 seconds to cross each other while they are running in the same direction . what time will they take to cross each other if they are running in opposite directions ?
Example Output: 6.6

Example Input: Problem: a jeep takes 9 hours to cover a distance of 480 km . how much should the speed in kmph be maintained to cover the same direction in 3 / 2 th of the previous time ?
Example Output: 35 kmph

Example Input: Problem: john makes $ 40 a week from his job . he earns a raise and now makes $ 80 a week . what is the % increase ?
Example Output:
100