An elevator has mass 775 kg, not including passengers. The elevator is designed to ascend, at constant speed, a vertical distance of 20.0 m (five floors) in 18.0 s, and it is driven by a motor that can provide up to 49.0 hp to the elevator. What is the maximum number of passengers that can ride in the elevator? Assume that an average passenger has mass 70.0 kg. 1 hp = 746 W.

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