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NEET Class neet Answered

. Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time
Asked by alliedsonyeric | 08 Aug, 2021, 13:13: PM
answered-by-expert Expert Answer
Let d be the distance to be travelled .
 
Walking speed of Preeti on stationary escalator = ( d / t1 ) 
 
Speed of escalator alone when Preeti remains stationary = ( d / t2 )
 
Speed v of Preeti while walking on a moving escaltor seen from statioanry observer
away from  escaltoris given as
 
v = ( d / t1 ) + ( d / t2 )  = d ( t1 t2 ) / ( t1 + t2 )
 
Time taken if preeti is walking on a moving escalator = distance / speed = d / v  = ( t1 + t2 ) / ( tt)

Answered by Thiyagarajan K | 08 Aug, 2021, 14:38: PM
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