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Up an Escalator

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Adam takes the underground train to work and uses an escalator at the railway station. If Adam runs up 8 steps of the escalator, then it takes him 25.5 seconds to reach the top of the escalator. If he runs up 15 steps of the escalator, then it takes him only 15.0 seconds to reach the top.

How many seconds would it take Adam to reach the top if he did not run up any steps of the escalator at all?
  puzzle : image for escalator  

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