(Answered) A shopper in a department store can walk up a stationary

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A shopper in a department store can walk up a stationary (stalled) escalator in 6 s. If the normally functioning escalator can carry the standing shopper to the next floor in 11 s, how long would it take the shopper to walk up the moving escalator? Assume the same walking effort for the shopper whether the escalator is stalled or moving.

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