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

Example Input: Problem: a train 360 m long runs with a speed of 45 km / hr . what time will it take to pass a platform of 150 m long ?
Example Output: 40.8 sec

Example Input: Problem: the profits of qrs company rose 30 % from march to april , then dropped 20 % from april to may , then rose 50 % from may to june . what was the percent increase for the whole quarter , from march to june ?
Example Output: 56 %

Example Input: Problem: a train is 250 meter long is running at a speed of 36 km / hour . in what time will it pass a station of 200 meter length ?
Example Output:
45 seconds