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A boy reaches the airport and finds that...

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 :

A

`t_(2)+t_(1)`

B

`t_(1)+t_(2)`

C

`(t_(1)t_(2))/(t_(2)-t_(1))`

D

`(t_(1)t_(2))/(t_(2)+t_(1))`

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