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

[Q]: 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 ?
[A]: 20 min

[Q]: Problem: the average of numbers 0.34204 , 0.34203 , 0.34202 and 0.34201 is ?
[A]: 0.342025

[Q]: Problem: teas worth rs . 126 per kg and rs . 135 per kg are mixed with a third variety in the ratio 1 : 1 : 2 . if the mixture is worth rs 153 per kg , the price of the third variety per kg will be ?
[A]:
rs . 175.50