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A bicycle wheel has a diameter 0.71m. How many complete

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A bicycle wheel has a diameter 0.71m. How many complete [#permalink] New post 06 Jan 2013, 05:37
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55% (02:25) correct 44% (00:00) wrong based on 1 sessions
A bicycle wheel has a diameter of 0.71m. How many complete revolutions does it make in 1km?

A. 246
B. 448
C. 1408
D. 710
E. 223
[Reveal] Spoiler: OA

Last edited by Bunuel on 07 Jan 2013, 02:10, edited 1 time in total.
Edited the question.
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Re: A bicycle wheel has a diameter 0.71m.How many complete revol [#permalink] New post 06 Jan 2013, 05:43
1 revolution = 3.14 * diameter.
Number of revolutions in 1km = 1000m / ( 3.14 * 0.71m ) = 448.5. Hence 448 complete revolutions.
Re: A bicycle wheel has a diameter 0.71m.How many complete revol   [#permalink] 06 Jan 2013, 05:43
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