Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time t_1. On other days, if she remaines stationary on moving esclalator, then the escalator takes her up in time t₂. The time taken by her to walk up on the moving escalator will be

1) t₁ + t₂ / 2

2) t₁t₂/t₂ - t₁

3) t₁t₂ / t₂ + t₁

4) t₂ - t₁

Now I have solved the question and I am getting answer (2) but answer is (3) as shown is attachment . Dont relative velocities of two body moving in same direction is found out by subtraction.?

Please explain.

Aabha Misra

8 Years agoGrade 12th pass