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Physics Preparation for SAT

(1 Posts)

This thread is dedicated to preparation for Physics section of SAT (Subject).

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Manish Verma
Posted on Sep 17, 2013 7:20 AM

Time taken by a boy to reach point A to B when escalator is rest is t1 sec. When escalator is moving time taken by that boy to reach A to B is t2 sec.When both are moving how much time taken by boy to reaching point A to B?

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Let the distance be d m. velocity of boy=d/t1. velocity of escalator=d/t2 . when both are moving time taken =d/v1+v2 = t1t2/t1+t2