Waiting for an elevator. The manager of a large department store with three floors reports that the

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Waiting for an elevator. The manager of a large department store with three floors reports that the time a customer on the second floor must wait for an elevator has a uniform distribution ranging from 0 to 5 minutes. If it takes the elevator 20 seconds to go from floor to floor, find the probability that a hurried customer can reach the first floor in less than 2 minutes after pushing the second-floor elevator button.

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