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# If a bicycle wheel has a radius of 14 inches. HOw many

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Manager
Joined: 23 Mar 2008
Posts: 218
If a bicycle wheel has a radius of 14 inches. HOw many [#permalink]

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06 Apr 2008, 10:45
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

If a bicycle wheel has a radius of 14 inches. HOw many revolutions will the wheel make in a mile? ( 1 mile = 5.280 feet)

a) 5.280/28 pi
b) 63.360/ 196 pi
c) 5.280/ 14 pi
d) 15.840/ 7 pi
e) 63.360 / 14
Senior Manager
Joined: 28 Feb 2007
Posts: 302

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06 Apr 2008, 10:54
D.
let's be:
C-circumference of the wheel.
X-#of revolutions
C=2*Pi*r/12=7*Pi /3 (in feet)
X=5280/C=D
Intern
Joined: 02 Apr 2008
Posts: 37

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06 Apr 2008, 12:20
UMB wrote:
D.
let's be:
C-circumference of the wheel.
X-#of revolutions
C=2*Pi*r/12=7*Pi /3 (in feet)
X=5280/C=D

Why do you divide it by 12? Thx
SVP
Joined: 28 Dec 2005
Posts: 1559

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06 Apr 2008, 14:21
D for me as well.

Circumference is 7/3*pi feet

in 1 mile then, we go 5.28*(3/7*pi) = 15.84/7 * (pi)
Intern
Joined: 08 Apr 2008
Posts: 26

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12 Apr 2008, 08:35
the circumference is 2*pi*r. why did you guys divide by 12?

I got A.
Manager
Joined: 11 Apr 2007
Posts: 143

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12 Apr 2008, 11:06
Brindusa wrote:
the circumference is 2*pi*r. why did you guys divide by 12?

I got A.

1 feet = 12 inch
Re: revolutions   [#permalink] 12 Apr 2008, 11:06
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# If a bicycle wheel has a radius of 14 inches. HOw many

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