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GMATCLUB Question M21 Q 27

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Senior Manager
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GMATCLUB Question M21 Q 27 [#permalink]

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New post 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

Earlier had similar problem, but still can not get the explanation, please help
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Kudos [?]: 145 [0], given: 16

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Re: GMATCLUB Question M21 Q 27 [#permalink]

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New post 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

Earlier had similar problem, but still can not get the explanation, please help


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
Senior Manager
avatar
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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New post 21 Jan 2010, 09:16
Nice explanation, thank you
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Kudos [?]: 145 [0], given: 16

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Re: GMATCLUB Question M21 Q 27 [#permalink]

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New post 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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