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

Ex Input:
Problem: a cat chases a rat 6 hours after the rat runs . cat takes 4 hours to reach the rat . if the average speed of the cat is 90 kmph , what s the average speed of the rat ?

Ex Output:
36 kmph

Ex Input:
Problem: what is the total number of integers between 10 and 50 that are divisible by 2 ?

Ex Output:
19

Ex Input:
Problem: in a fuel station the service costs $ 1.75 per car , every liter of fuel costs 0.65 $ . assuming that a company owns 12 cars and that every fuel tank contains 50 liters and they are all empty , how much money total will it cost to fuel all cars ?

Ex Output:
411