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Up an Escalator

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Robert takes the underground train to work and uses an escalator at the railway station. If Robert runs up 8 steps of the escalator, then it takes him 43.5 seconds to reach the top of the escalator. If he runs up 14 steps of the escalator, then it takes him only 34.5 seconds to reach the top.

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


 
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