instruction:
The task is to generate the correct answer for a given math problem.
question:
Problem: two trains of equal length , running with the speeds of 60 and 90 kmph , take 50 seconds to cross each other while they are running in the same direction . what time will they take to cross each other if they are running in opposite directions ?
answer:
6.6

question:
Problem: if 5 a = 3125 , then the value of 5 ( a - 3 ) is :
answer:
25

question:
Problem: how many prime numbers are between 25 / 3 and 84 / 6 ?
answer:
2