instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: 1370 , x , 1070 , - 180 , - 6430
answer:
1320


question:
Problem: a tyre has two punctures . the first puncture alone would have made the tyre flat in 9 minutes and the second alone would have done it in 6 minutes . if air leaks out at a constant rate , how long does it take both the punctures together to make it flat ?
answer:
335 min


question:
Problem: a tank is filled in 10 hours by 3 pipes a , b and c . the pipe c is twice as fast as b and b is twice as fast as a . how much time will pipe a alone take to fill the tank ?
answer:

70 hours