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

[EX Q]: Problem: a man whose speed is 4.5 kmph in still water rows to a certain upstream point and back to the starting point in a river which flows at 1.5 kmph , find his average speed for the total journey ?
[EX A]: 4

[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: how many integers are between 4 and 87 / 8 , inclusive ?
[EX A]:
7