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Finding Average Velocity

a man Walks u...

Question

a man Walks up a stationary escalator in 90 seconds when this man stands on a moving escalator he goes up and 60 seconds the time taken by the man to walk up the moving escalator is

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Solution

Distance traveled = D
speed of escalator = D/60 units
speed of the person = D/90 units

total speed = D /60 + D/90 = D/36 units
Time if walks on moving escalator = D/ [D/36] = 36 sec.

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