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 takne 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.	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 takne by her to walk up on the moving escalator will be
Answer» `(t_(1)+t_(2))//2` `t_(1)t_(2)//(t_(2)-t_(1))` `t_(1)t_(2)//(t_(2)+t_(1))` `t_(1)-t_(2)` ANSWER :C