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An elevator is required to carry eight people to the top of a 12-story building in less than 1 min. A counter weight is used to balance the mass of the empty elevator cage. Assume that an average person weighs 155 lbf and that each story has a height of 12 ft. What is the minimum size of motor (in hp) that can be used in this application? An elevator is required to carry eight people to the top of a 12-story building in less than 1 min. A counter weight is used to balance the mass of the empty elevator cage. Assume that an average person weighs 155 lbf and that each story has a height of 12 ft. What is the minimum size of motor (in hp) that can be used in this application?