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A boy reaches the airport and finds that the escalator is not working. He walks up the stationary escalator in time 6s. If he remains stationary on a moving escalator then the escalator takes him up in 3s. The time taken by him to walk up on the moving escalator 


 

 

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answer is 2.

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Detailed Solution

t= t 1 t 2 t 1 + t 2   = 6×3 6+3 =2s  
 
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