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: if a * b * c = ( √ ( a + 2 ) ( b + 3 ) ) / ( c + 1 ) , find the value of 6 * 15 * 1 .

Ex Output:
2


Ex Input:
Problem: how long will a boy take to run round a square field of side 35 meters , if he runs at the rate of 9 km / hr ?

Ex Output:

56