Question

An elevator descends into a mineshaft at the rate of 5m per minute. If it starts
15m above the ground how long will it take to reach - 235m down the earth? If
the descent starts from the ground level what will be the position after 20
minutes

Answer 1

Answer:

The answer id 85

Step-by-step explanation:

an elevator descends into mine shaft at the rate of 5 meter per minute.

so for 1 min elevator descends 5metres.

the position of the elevator after one hour =

we know 1 hour =60 min so 60min x 5metres=300 meters..

but the elevator began to descend from 15 meters above so,

300-15="285metres."

and its position after 20 mins is 20metres x 5 mins=100 meters.

and the elevator has descended from 15 meters above so

100-15 meters="85metres."

Hope this helps you and mark me as brainliest

Answer 2

Answer:

50 minutes

Step-by-step explanation:

The elevator descends 5 metre per minute

15 - (-235)

15 + 235 = 250

250 metres to travel

if you can travel 5 metre per minute

250 / 5 = 50 minutes