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

Input: Consider Input: Problem: bob wants to run a mile in the same time as his sister . if bob ’ s time for a mile is currently 11 minutes 20 seconds and his sister ’ s time is currently 9 minutes 36 seconds , by what percent does bob need to improve his time in order run a mile in the same time as his sister ?

Output: 15 


Input: Consider Input: Problem: a train running at the speed of 72 km / hr crosses a pole in 9 seconds . find the length of the train .

Output: 180 meter


Input: Consider Input: Problem: the average age of 25 students in a class is 12 years . 15 students whose average age is 10 years joined them . what is the present average age .


Output: 11.25