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When a man stands on a moving escalator he goes up in 50 sec. and when he walks up the moving escalator he goes up in 30 sec. Then the man walks up the stationary escalator in a time of ........ sec

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A man standing on a moving escalator, completes a certain distance in time t_(1) . If the escalator does not move then man covers this distance in time t_(2) by walking. (i) How much time will he take to cover the same distance if he move on the moving escalator in the same direction ? (ii) How much time will he take to cover the same distance if he move on the moving escalator in the opposite direction ?

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AAKASH SERIES-MOTION IN A STRAIGHT LINE -Numerical exercise(LEVEL-2)
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