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

[Q]: Problem: a train covers a distance of 100 km in 1 hour . if its speed is decreased by 10 km / hr , the time taken by the car to cover the same distance will be ?
[A]: 1 hr 6 min


[Q]: Problem: sachin is older than rahul by 7 years . if the ratio of their ages is 11 : 9 , find the age of sachin
[A]: 38.5


[Q]: Problem: a rope of which a calf is tied is increased from 12 m to 23 m , how much additional grassy ground shall it graze ?
[A]:
1210