Question

13. An elevator descends into a coal mine at the rate of
10 m per 2 minutes. If it starts from 10 m above the
ground, how long will it take to reach (-120) m?​

Answer 1

Step-by-step explanation:

per minute is 5 m. the total distance -120-10 is -130 so 130/5 26 minutes

Answer 2

-120 m means 120 m below ground level and it starts from 10 m above the ground level thus total distance =120+10 ie 130 m

Speed of the elevator =10 m/2 min

Time =Distance/Speed
= 130/10
= 13

Thus the elevator will take 13 minutes to reach -120 m


Hope it will help you:)