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Started: 08/09/2010 03:24 PM
Picture: John Rowland
John Rowland
Escalator
Two escalators run side by side, one up and one down. Both move at the rate of 60 steps per minute. As I go up I pass 60 people coming down. It's a busy time. I notice every step is occupied by one person for the whole time and nobody is walking up or down.  How long was I on the escalator?