Time to Cross Trains: 200m & 150m, 40km/hr & 45km/hr

[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?

 

[Moetasim]

Based on the given information, we can calculate the relative speed of the two trains by subtracting the slower train's speed from the faster train's speed. In this case, the relative speed would be 45km/hr - 40km/hr = 5km/hr. This means that the two trains are getting closer to each other at a rate of 5 kilometers per hour.

To determine the time it would take for the trains to cross each other, we can use the formula Time = Distance/Speed. In this case, the distance between the two trains would be the sum of their lengths, which is 200m + 150m = 350m. Converting this distance to kilometers, we get 0.35km.

So, the time it would take for the trains to cross each other would be 0.35km/5km/hr = 0.07 hours. Converting this to minutes, we get 0.07 hours x 60 minutes/hour = 4.2 minutes. Therefore, it would take approximately 4.2 minutes for the two trains to cross each other if they are running in the same direction.