GMATCLUB Question M21 Q 27 : Retired Discussions [Locked]
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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, 13:54
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, 18:33
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.
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Re: GMATCLUB Question M21 Q 27 [#permalink]

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21 Jan 2010, 08:16
Nice explanation, thank you
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Re: GMATCLUB Question M21 Q 27 [#permalink]

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13 Apr 2010, 12:16
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, 12:16
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# GMATCLUB Question M21 Q 27

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