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

Problem: at what rate percent on simple interest will rs . 750 amount to rs . 900 in 8 years ?
2.5 %

Problem: a and b can do a piece of work in 7 days . with the help of c they finish the work in 5 days . c alone can do that piece of work in ?
30 days

Problem: two trains of length 180 m and 280 m are running towards each other on parallel lines at 42 kmph and 30 kmph respectively . in what time will they be clear of each other from the moment they meet ?
23 sec