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?

Answer 1

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