What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?
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The ground level is to be the zero level. When the elevator moves above the ground level, it is moving towards the positive integer and when the elevator moves below the ground level, it is moving towards the negative integer.
Elevator 2 moved down 6 feet from the ground level hence its position is labelled as
Elevator 2 moved down 6 feet from the ground level hence its position is labelled as