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

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 ?
6.6

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 ?
12

Problem: a train speeds past a pole in 25 seconds and a platform 150 m long in 30 seconds . its length is ?

30

