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A circular rim 28 inches in diameter rotates the same number

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A circular rim 28 inches in diameter rotates the same number [#permalink] New post 04 Oct 2011, 20:36
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87% (02:38) correct 12% (02:25) wrong based on 2 sessions
A circular rim 28 inches in diameter rotates the same number of inches per second as a circular rim 35 inches in diameter. If the smaller rim makes x revolutions per second, how many revolutions per minute does the later rim make in terms of x?

A) \frac{48P}{x}
B) 75x
C) 48x
D) 24x
E) \frac{x}{75}


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Re: Rim rotation [#permalink] New post 04 Oct 2011, 21:19
Is it only me that I am not able to see the attachment ? Am i missing some privilege?
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Re: Rim rotation [#permalink] New post 04 Oct 2011, 22:33
kulki wrote:
Is it only me that I am not able to see the attachment ? Am i missing some privilege?

Please click on the attachment .it will be visible
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Re: Rim rotation [#permalink] New post 05 Oct 2011, 00:02
[(Rev/sec) x circumference] of 28 inches rim = [(Rev/sec) x circumference] of 35 inches rim
x x 28Pi = y x 35Pi
y = \frac{4}{5}x

But this is rev/sec. Converting to minutes we get
y = \frac{4}{5}x x 60
y = 48x
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Re: Rim rotation [#permalink] New post 05 Oct 2011, 09:15
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braxus wrote:
[(Rev/sec) x circumference] of 28 inches rim = [(Rev/sec) x circumference] of 35 inches rim
x x 28Pi = y x 35Pi
y = \frac{4}{5}x

But this is rev/sec. Converting to minutes we get
y = \frac{4}{5}x x 60
y = 48x

Missed the per minute thing....
Re: Rim rotation   [#permalink] 05 Oct 2011, 09:15
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