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

Input: Consider Input: Problem: excluding stoppages , the average speed of a bus is 60 km / hr and including stoppages , the average speed of the bus is 40 km / hr . for how many minutes does the bus stop per hour ?

Output: 20 min


Input: Consider Input: Problem: a cycle is bought for rs . 900 and sold for rs . 1170 , find the gain percent ?

Output: 30 %


Input: Consider Input: Problem: tanks a and b are each in the shape of a right circular cylinder . the interior of tank a has a height of 10 meters and a circumference of 9 meters , and the interior of tank b has a height of 9 meters and a circumference of 10 meters . the capacity of tank a is what percent of the capacity of tank b ?


Output: 90 %