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Relative velocity of two trains moving in opposite directions

This type of question, asked 2 times: 13 Apr 2023, 1 Feb 2024. All 2 questions below, oldest first.

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  1. Question 1

    13 Apr 2023

    96
    A passenger sitting in a train A moving at 90 km/h90\text{ }km/h observes another train B moving in the opposite direction for 8 s8\text{ }s. If the velocity of the train BB is 54 km/h54\text{ }km/h, then length of train B is:

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  2. Question 2

    1 Feb 2024

    104
    Train A is moving along two parallel rail tracks towards north with speed 72 km/h72\text{ }km/h and train BB is moving towards south with speed 108 km/h108\text{ }km/h. Velocity of train BB with respect to AA and velocity of ground with respect to BB are (in ms−1ms^{- 1} ) :

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