A wheel has a diameter of x inches and a second wheel has a diameter of y inches. The first wheel covers a distance of d feet in 120 revolutions. How many revolutions does the second wheel make in covering d feet?
Choices
A) 120y/x  B) 120-y  C) 120-x  D) 120x/y  E) 120x-y
A wheel covers 2πr distance in one revolution. where r= diameter/2   First wheel covers d feet in 120 rev. =&gt; d= 120* 2π * (x/2)   Second wheel covers d feet in let's say P revolutions; =&gt; d = P* 2π * (y/2)   comparing both equations:-   =&gt; p= (120∗2π∗x/2)/(2π∗y/2)   =&gt; 120x/y   Answer :- 120x/y
<result>D</result>
A wheel has a diameter of x inches and a second wheel has a diameter of y inches. The first wheel covers a distance of d feet in 120 revolutions. How many revolutions does the second wheel make in covering d feet?