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At a metro station, a girl walks up a st...

At a metro station, a girl walks up a stationary esclator 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) //2`

B

`t_1t_2//(t_2-t_1)`

C

`t_1t_2//(t_2 + t_1)`

D

`t_1 - t_2`

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