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

[Q]: Problem: in a kilometer race , a beats b by 48 meters or 12 seconds . what time does a take to complete the race ?
[A]: 238 sec


[Q]: Problem: you enter a weight loss challenge game and manage to lose 12 % of your body weight . for the final weigh in you are forced to wear clothes that add 2 % to your weight . what percentage of weight loss is measured at the final weigh in ?
[A]: 10.24 %


[Q]: Problem: a take twice as much time as b or thrice as much time to finish a piece of work . working together , they can finish the work in 7 days . b can do the work alone in ?
[A]:
42