Test Preparation on Motion in One Dimension-I- Physics Test Series For NEET 2020

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 remains stationary on the
moving escalator, then the escalator takes her up in time t_2.
The time taken by her to walk up on the moving escalator
will be

Which of the following is a one dimensional motion

A 150 m long train is moving with a uniform velocity of 45
km/h. The time taken by the train to cross a bridge of length
850 m is