Aperson 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

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

Step-by-step 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

Substituting the given values we get

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

Substituting  Speed and Distance we get

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

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