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A gold mine has two elevators, one for equipment and another for the miners. The equipment elevator begins to descends 5 feet per second. The elevator for the miners descends 15 feet per second. One day, the equipment elevator begins to descend. After 28 seconds, the elevator for the miners begins to descend. What is the position of each elevator relative to the surface after another 11 seconds? At the time, which elevator is deeper?
