Vikas takes 40 seconds to walk up a stationary escalator, and 60 seconds to reach the top when he stands still on the same escalator while it is running. Walking up the running escalator, he reaches the top in how many seconds?

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Accepted Answer

24. Rates add: his walking rate is 1/40 of the escalator per second and the escalator's rate is 1/60. Together = 1/40 + 1/60 = 5/120 = 1/24, so the trip takes 24 seconds.

Vikas takes 40 seconds to walk up a stationary escalator, and 60 seconds to reach the top when he stands still on the same escalator while it is running. Walking up the running escalator, he reaches the top in how many seconds?

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