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

Ex Input:
Problem: the speed of a car is 85 km in the first hour and 45 km in the second hour . what is the average speed of the car ?

Ex Output:
65 kmph


Ex Input:
Problem: a 9 % stock yields 8 % . the market value of the stock is :

Ex Output:
rs . 112.50


Ex Input:
Problem: what is 121 times 11 ?

Ex Output:

1331