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
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-
A. `(t_(1)+t_(2))//2`
B. `t_(1)t_(2)//(t_(2)-t_(1))`
C. `t_(1)t_(2)//(t_(2)+t_(1))`
D. `t_(1)-t_(2)`
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