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Q: wheel diameter/speed question ( Answered,   0 Comments )
Subject: wheel diameter/speed question
Category: Reference, Education and News > Homework Help
Asked by: biga626-ga
List Price: $2.00
Posted: 23 Feb 2005 18:06 PST
Expires: 25 Mar 2005 18:06 PST
Question ID: 479729
If a car has wheels with a diameter of three feet.  About how many
miles per hour is the car going, if the wheels are turning at about
600 times per minute?
Subject: Re: wheel diameter/speed question
Answered By: markj-ga on 23 Feb 2005 18:50 PST
biga626 --

The answer is approximately 64.26 miles per hour.

The formula for solving the problem is found at this website:

Math Forum

The formula described there for this problem is:

(minutes in an hour) X (revolutions per minute) X (wheel diameter in
inches) X (pi)  DIVIDED BY (feet in a mile) times (inches in a foot) =
(speed in miles per hour)

Using the numbers you have stated, the problem then would be:

60 X 600 X 36 X 3.1416  DIVIDED BY 5280 X 12

The answer to that problem, as I stated above, is 64.26 mph

Search Strategy:

I found the formula with the following Google search:

formula diameter wheel speed minute

I urge you to visit the site linked above to get a fuller
understanding of the problem and its solution.  Other sites returned
as "hits" with the Google search terms I used could also be helpful to

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