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

Ex 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 ?

Ex Output:
20 min

Ex Input:
Problem: a bullet train covers a distance in 50 min , if it runs at a speed of 48 kmph on an average . the speed at which the bullet train must run to reduce the time of journey to 40 min will be .

Ex Output:
60 kmph

Ex Input:
Problem: find the 10 th term of an arithmetic progression whose first term is 8 and the common difference is 2 .

Ex Output:
26