Question 958122
.
How many revolutions per second will an automobile wheel make at the rate of 63.4km per hour 
if the diameter is 5.4dm ?
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        This is a simple arithmetic problem, but the answer "1957 revolutions per second"
        given in the post by @lwsshar3 is absolutely absurdist.


        Not only the answer, but his approach in whole and his method are 

        absolutely inappropriate for the solution and for teaching.


        He concentrates on deriving very long formula, which is not needed,

        instead of concentrating on the problem's meaning. As a result, he was not able 

        to solve the problem correctly.


        See below my correct solution, as it should be done by a 5-th or 6-th grade student.



<pre>
The diameter of the wheel is d = 5.4 decimeters, or d = 54 centimeters.


Hence, the circumference of the wheel is {{{pi*d}}} = {{{3.14159*54}}} = 169.65 cm.


The car moves forward 63.4 km per hour, or  {{{63400/3600}}} = 17.61 meters per second, or 1761 centimeters per second.


From it, the number of revolutions per second is the ratio  {{{1761/169.65}}} = 10.38, approximately.


<U>ANSWER</U>.  The number of revolutions per second is 10.38.
</pre>

Solved correctly.


As I read this post by @lwsshar3, it proves to me once again, for the 1001st time, that this person does not read 
what his computer code produces.