At a metro station, a girl walks up a stationaryescalator in time `t_(1)`. If she remains stationary on the escalator, then the escalator take her up in time `t_(2)`. The time taken by her to walk up on the moving escalator will be-

At a metro sttion ,a girl walks up a stationary escalator in time t_(2) .If she remains stationary on the escalator,then the escalator take her up in time t_(2) .The time taken by her to walk up on the moving escalator will be

At a metro station, a girl walks up a stationary escalator in time t_1 If she remains stationary on the escalator, then the escalator take her up in time t_2 . The time taken by her to walk up the moving escalator will be.

At a metro station, a girl walks up a stationary escalator in time t_1 If she remains stationary on the escalator, then the escalator take her up in time t_2 . The time taken by her to walk up the moving escalator will be.

At a metro station, a girl walks up a stationary escalator in time t_1 If she remains stationary on the escalator, then the escalator take her up in time t_2 . The time taken by her to walk up the moving escalator will be.

At a metro station, a girl walks up a stationary escalator in time t_1 If she remains stationary on the escalator, then the escalator take her up in time t_2 . The time taken by her to walk up the moving escalator will be.

A boy reaches the airport and finds that the escalator is not working. He walks up the stationary escalator in time t_(1) . If the remains stationary on a moving escalator then the escalator takes him up in time t_(2) . The time taken by him to walk up on the moving escalator will be :