Question

an elevator descends into a mine shaft at the rate of 6 metre per minute.The descent starts from 10 metre above sea level
1) where will it reach 20 minute
2) How long will it take to reach a depth of -350m​

Answer 1

Answer:

1) 110 meters below sea level

2) 1 hour

Step-by-step explanation:

1) if it goes down 6 meters a minnute, then we can multuply by that my the time (in this case 20 minutes) to see how deep it will go. Subtract that by 10 to account for how it starts 10 meters above sea level and you get 110 meters below sea level.

In equation form:

(6x20)-10=where it will reach in 20 min

120-10=where it will reach in 20 min

110=where it will reach in 20 min

2) we know it goes at 6 meters a minnute and that we start 10 meters above sea level, so first we take the depth we want to go (-350 meters) and add -10 to account for the 10 meters. that gives us -360 meters we want to travel. We divide that by the speed (6 meters a minnute) and we find how long it will take to reach -350 meters.

in equation form:

(-350-10)/6=the time it will take

-360/6=the time it will take

60 minnutes (1 hour)=the time it will take

Answer 2

Answer:

1.) 110 metres sea level

2.) 1 hour