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Up an Escalator

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Darren takes the underground train to work and uses an escalator at the railway station. If Darren runs up 7 steps of the escalator, then it takes him 30.0 seconds to reach the top of the escalator. If he runs up 15 steps of the escalator, then it takes him only 18.0 seconds to reach the top.

How many seconds would it take Darren 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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