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A building is 'x' meters tall and has an elevator which goes

from the ground floor to the terrace of the building.

Currently, it is at the 4th floor which is at a height of 20 m from the ground. From there, it goes to the terrace and then goes back to the ground floor.

Which of the following expressions represents the TOTAL distance covered by the elevator, in metres?

A. (2x-4)

B. (2x-20)

c. (2x+20)

D. (2x-40)

Please find below the solution to the asked query:

Given : A building is '

*x*' meters tall and has an elevator which goes from the ground floor to the terrace of the building.

And

Currently, it is at the 4

^{th}floor which is at a height of 20 m from the ground. From there, it goes to the terrace , So

Distance cover by lift from 4

^{th}floor to terrace = (

*x*- 20 ) meters

And then lift goes back to the ground floor. , So

Distance cover by lift from terrace to ground floor =

*x*meters

Therefore,

**Total distance covered by the elevator =**

*x*- 20 +*x*= ( 2*x*- 20 ) metersSo,

**Option ( B ) ( Ans )**

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