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Up an Escalator

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Graham takes the underground train to work and uses an escalator at the railway station. If Graham runs up 8 steps of the escalator, then it takes him 22.5 seconds to reach the top of the escalator. If he runs up 14 steps of the escalator, then it takes him only 13.5 seconds to reach the top.

How many seconds would it take Graham 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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