a gold mine has two elevators, one for equipment the other for miners. The equipment elevator descends 4 feet per seconds. The elevator for the miners descends 16 feet per seconds. One day, the equipment elevator begins to descend. After 17 seconds, the elevator for the miners begins to descend. What is the position of each relative to the surface after another 18 seconds? at time, witch elevator is deeper? the position of the equipment relative to the surface to the surface feet is? please help :D