Two trains A and B are moving in parallel tracks with velocities of 60kmh-¹ and 90kmh-¹ respectively but in opposite direction Find i)when will the relative velicity of the two trains be zero

Two trains A and B are moving in parallel tracks with velocities of 60

1.	Two trains A and B are moving in parallel tracks with velocities of 60kmh-¹ and 90kmh-¹ respectively but in opposite direction Find i)when will the relative velicity of the two trains be zero
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Two trains A and B are moving in parallel tracks with velocities of 60kmh-¹ and 90kmh-¹ respectively but in opposite direction Find i)when will the relative velicity of the two trains be zero​

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Two trains A and B are moving in parallel tracks with velocities of 60kmh-¹ and 90kmh-¹ respectively but in opposite direction Find i)when will the relative velicity of the two trains be zero