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

Input: Consider Input: Problem: two trains of length 100 meters and 200 meters are 450 meters apart . they are moving towards each other on parallel tracks , at speeds of 90 km / h and 72 km / h . after how many seconds will the trains meet ?

Output: 10


Input: Consider Input: Problem: the smallest value of n , for which n + 2 is not a prime number , is

Output: 2,4


Input: Consider Input: Problem: a train moves with a speed of 216 kmph . its speed in metres per second is


Output: 6