An Escalator Puzzle
Bob takes the underground train to work and uses an escalator at the railway station. If Bob runs up 6 steps of the escalator, then it takes him 52.5 seconds to reach the top of the escalator. If he runs up 14 steps of the escalator, then it takes him only 32.5 seconds to reach the top.
How many seconds would it take Bob to reach the top if he did not run up any steps of the escalator at all?
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