I cannot understand how to apply the concept of relative velocity in certaijn questions like the below one(adsbygoogle = window.adsbygoogle || []).push({});

the question is Two trains A and B of length 400m each are moving on two parallel tracks with a uniform speed of 72km/hr in the same direction with A ahead of B The driver of B decides to overtake A and accelerates byt 1m/s2 If after 50s the guard of B just brushes past the driver of A, what was the original distance between them?

sir, I know that train B's acceleration is 1m/s^2 time is 50s initial velocity is O and by equations of motion we can find the distance. But my teacher said here the concept of relative velocity comes into play. Please explain me why and how?

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# Apply the concept of relative velocity

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