Question

Two trains A and B of length 200 m each are moving on two parallel tracks with
a uniform speed of 54 km h-1 in the same direction, with A ahead of B. The
driver of B decides to overtake A and accelerates by 1 m s-2. If after 50 s, the
guard of B just brushes past the driver of A, what was the original distance
between them?​

Answer 1

Answer:

This is the answer that I have and in picture.