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JEE Main201912 Jan 2019Morning ShiftPhysicsMotion in Two DimensionsActual

A passenger train of length 60 m travels at a speed of 80 km / hr . Another freight train of length 120 m travels at a speed of 30 km / hr . The ratio of times taken by the passenger train to completely cross the freight train when: (i) they are moving in the same direction, and (ii) in the opposite directions is:

Options

  1. A5 2
  2. B3 2
  3. C11 5
  4. D25 11

Correct answer

C. 11 5

Step-by-step solution

t 1 = 2 60 + 120 80 - 30 t 2 = 2 60 + 120 80 + 30 t 1 t 2 = 11 5

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