instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: a train running at the speed of 72 km / hr crosses a pole in 9 seconds . find the length of the train .
answer:
180 meter


question:
Problem: three 7 faced dice are thrown together . the probability that all the three show the same number on them is ?
answer:
1 / 49


question:
Problem: if a / b = 4 / 5 , then ( 5 a - 3 b ) / ( 5 a + 3 b ) = ?
answer:

1 /