Hep me to find time

[neha1]

two trains 200 meters and 150 metrers are running on the parallel raila at this rate of 40km/hr and 45 km/hr.in how time will they cross each other if they are running in the same direction?

 

[Hootenanny]

two trains 200 meters and 150 metrers are running on the parallel raila at this rate of 40km/hr and 45 km/hr.in how time will they cross each other if they are running in the same direction?

Hi neha1 and welcome to PF,

For future reference, we have https://www.physicsforums.com/forumdisplay.php?f=152" for such questions, but don't worry your thread will get moved there later.

Now for your question. What have you attempted thus far?