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# GMATCLUB Question M21 Q 27

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GMATCLUB Question M21 Q 27 [#permalink]

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17 Jan 2010, 14:54
Between 10:06 and 12:30 the hour hand of the clock turns by

66 degrees
70 degrees
72 degrees
75 degrees
78 degrees

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Re: GMATCLUB Question M21 Q 27 [#permalink]

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17 Jan 2010, 19:33
mirzohidjon wrote:
Between 10:06 and 12:30 the hour hand of the clock turns by

66 degrees
70 degrees
72 degrees
75 degrees
78 degrees

The time difference is 2 hours and 24 minutes
The clock is 360 degrees
There are 12 hour segments on the clock so each segment is 30 degrees (360/12). In two hours the clock moves 2 segments or 60 degrees so now we need to account for 24 minutes. A 360 degree turn by the minute hand equals one hour. 24/60 (24 minutes/60 minutes or one complete turn) = 2/5 of an hour. Each hour = 30 degrees so 2/5*30 = 12 degrees so 72 degrees total.

Kudos [?]: 307 [0], given: 31

Senior Manager
Joined: 18 Aug 2009
Posts: 416

Kudos [?]: 145 [0], given: 16

Schools: UT at Austin, Indiana State University, UC at Berkeley
WE 1: 5.5
WE 2: 5.5
WE 3: 6.0
Re: GMATCLUB Question M21 Q 27 [#permalink]

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21 Jan 2010, 09:16
Nice explanation, thank you
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Joined: 12 Oct 2009
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Location: Malaysia
Concentration: Technology, Entrepreneurship
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Re: GMATCLUB Question M21 Q 27 [#permalink]

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13 Apr 2010, 13:16
12 hour = 360
1 hour = 30
60 min = 30
1 min = 1/2 degree

find the total minutes and divide be 2..you will get 72
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Re: GMATCLUB Question M21 Q 27   [#permalink] 13 Apr 2010, 13:16
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# GMATCLUB Question M21 Q 27

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