Question
Why does a person sitting in one train think that the other train is at rest, when both trains are moving on parallel tracks with the same speed and in the same direction?
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Answer
This is because the relative velocity of the train in which the person is sitting w.r.t. the other train is zero.
For example, let the velocity of A train = 60km/ hr due east
Velocity of B train = 60km/ hr due east
$\therefore$ Relative velocity of A train w.r.t. B train = 60 - 60 = 0
For example, let the velocity of A train = 60km/ hr due east
Velocity of B train = 60km/ hr due east
$\therefore$ Relative velocity of A train w.r.t. B train = 60 - 60 = 0
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