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

Example Input: Problem: a train 200 m long can cross an electric pole in 5 sec and then find the speed of the train ?
Example Output: 144

Example Input: Problem: find the area of trapezium whose parallel sides are 20 cm and 18 cm long , and the distance between them is 20 cm ?
Example Output: 380 cm 2

Example Input: Problem: a cistern has a leak which would empty the cistern in 20 minutes . a tap is turned on which admits 5 liters a minute into the cistern , and it is emptied in 24 minutes . how many liters does the cistern hold ?
Example Output:
60