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

[EX Q]: Problem: two tains of equal lengths take 10 seconds and 15 seconds respectively to cross a telegraph post . if the length of each train be 120 metres , in what time ( in seconds ) will they cross each other travelling in opposite direction ?
[EX A]: 12

[EX Q]: Problem: ? x 12 = 173 x 240
[EX A]: 3460

[EX Q]: Problem: a train moves with a speed of 135 kmph . its speed in metres per second is
[EX A]:
37.5