Question

A person on a moving sidewalk 21 feet in 7 senconds the moving sidewalk has a lenght of 180 feet. How long will it take to move from one end of the sidewalk to other

Answer 1

He will take 60 seconds to move from one end of the sidewalk to other.

Explanation:

Given:

A person on a moving sidewalk,

21 feet in 7 seconds

Then 180 feet

To Find:

Total time =?

Solution:

Speed:

Speed is defined as the rate of distance covered in per unit time.

It is given as

`\textrm{Speed }=\frac{\textrm{Distance}}{Time}`

Substituting the given values we get

`\textrm{Speed }=(21)/(7)=3\ m/s`

Now, With this speed if he walk 180 feet then the time is

`\textrm{Time}=\frac{\textrm{Distance}}{Speed}`

Substituting Speed and Distance we get

`\textrm{Time}=(180)/(3)=60\\\\Time=60\ s`

He will take 60 seconds to move from one end of the sidewalk to other.