Question

an elevator descends at the rate of 3m/min. if it starts from 50m above the ground level ,how long will it take to reach -10m​

Answer 1

$\textbf{Given:}$

• Elevator descends at the rate of 3m/min
• Inital position=50 m
• Final position= -10m

$\textbf{To find:}$

Time taken by it to reach -10m

$\textbf{Solution:}$

Total distance it has to travel:

=>Initial position-Final position

=>50-(-10)

=>50+10

=>60 m

$\textbf{A/Q}$

=>Elevator descends at the rate of 3 m/min.

Therefore, it covers 3 m in= 1 minute.

It covers 1 m in=3/1 minute

Elevator covers 60 m in

$= > \frac{1}{3} \times 60 \: mins$

$= > 20 \: mins$

Hence, it will cover the required distance in 20 minutes.

$\textbf{Correct answer:}$

20 minutes

Answer 2

Step-by-step explanation:

Elevator descends at the rate of 3m/min

Inital position=50 m

Final position= -10m

\textbf{To find:}To find:

Time taken by it to reach -10m

\textbf{Solution:}Solution:

Total distance it has to travel:

=>Initial position-Final position

=>50-(-10)

=>50+10

=>60 m

\textbf{A/Q}A/Q

=>Elevator descends at the rate of 3 m/min.

Therefore, it covers 3 m in= 1 minute.

It covers 1 m in=3/1 minute

Elevator covers 60 m in

= > \frac{1}{3} \times 60 \: mins=>

3

1

×60mins

= > 20 \: mins=>20mins

Hence, it will cover the required distance in 20 minutes.

\textbf{Correct answer:}Correct answer:

20 minutes