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

[EX Q]: Problem: two pipes a and b can separately fill a cistern in 60 minutes and 75 minutes respectively . there is a third pipe in the bottom of the cistern to empty it . if all the three pipes are simultaneously opened , then the cistern is full in 50 minutes . in how much time , the third pipe alone can empty the cistern ?
[EX A]: 100 min

[EX Q]: Problem: a train running at the speed of 70 km / hr crosses a pole in 9 sec . what is the length of the train ?
[EX A]: 175 m

[EX Q]: Problem: 65 % of x = 20 % of 682.50 . find the value of x ?
[EX A]:
210