Question

An elevator deacends into mine shaft at the rate of 6m/min. If the descent starts from 10m above the ground level, how long will it take to reach -350?

Solution

An elevator descends into mine shaft at the rate of 6 meter per minute. so for 1 min elevator descends 6 metres. the position of the elevator after one hour =We know 1 hour =60 min so 60min x 6metres=360 meters.. but the elevator began to descend from 10 meters above so, 360-10=350 -350 shows it is below the ground level So the answer is 60 minute or 1 hour

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