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Train A is moving along two parallel rail tracks towards north with speed 72 km/h and train B is moving towards south with speed 108 km/h. Velocity of train B with respect to A and velocity of ground with respect to B are (in ms –1 )

1. –50 and –30
2. 50 and –30
3. –50 and 30
4. –30 and 50

Correct answer: –50 and 30

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