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

[EX 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 ?
[EX A]: 20 min

[EX Q]: Problem: a train crosses a bridge of length 200 m in 10 seconds and a lamp post on the bridge in 5 seconds . what is the length of the train in metres ?
[EX A]: 200 m

[EX Q]: Problem: what will be the compound interest on a sum of rs . 20,000 after 3 years at the rate of 12 % p . a . ?
[EX A]:
rs . 8098.56