Question

An elevator descends into a coal mine at the rate of 10 per 2 minutes. If it starts from 10 metre above the ground. How long will it takes to reach (-120)m²

Class-7th​

Answer 1

Answer:

26 minutes

Step-by-step explanation:

10metre / 2minute = 5metre/minute

Starts at 10m above the ground... to reach the ground level it will take 2 minutes.
Then descending to -120metres below the ground... it will be another 24 minutes.
120/5 = 24

Therefore, that is 24 + 2... 26 minutes.