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 Q50  V37
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Re: What is the angle between the minute and the hour hand of the clock wh [#permalink]
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ritula wrote:
What is the angle between the minute and the hour hand of the clock which shows 12:24?

115
120
124
130
132


At 12:24
-minute hand will be at 24*6 = 144 degrees from position of 12.
- Hour hand will move by 2*6 = 12 degree during the same time

So the difference between the two hands will be 144-12 = 132 degrees.
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Re: What is the angle between the minute and the hour hand of the clock wh [#permalink]
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hour hand moves 5 minutes when minute hand moves 60 minutes. Hence when minute hand moved 24 minutes, hour hand moved 24 *5 / 60 i.e. 2 minutes.
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Re: What is the angle between the minute and the hour hand of the clock wh [#permalink]
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ritula wrote:
can u pls explain this?
alpha_plus_gamma wrote:

At 12:24
-minute hand will be at 24*6 = 144 degrees from position of 12.
- Hour hand will move by 2*6 = 12 degree during the same time

So the difference between the two hands will be 144-12 = 132 degrees.


yeah, exactly in the way provided by gameCode

gameCode wrote:
hour hand moves 5 minutes when minute hand moves 60 minutes. Hence when minute hand moved 24 minutes, hour hand moved 24 *5 / 60 i.e. 2 minutes.
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Re: What is the angle between the minute and the hour hand of the clock wh [#permalink]
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I read somewhere there is a direct formula to solve this question..2)
Angle between m and h hand is ( 11/2) *m – 30 * h
can this be apply here? if yes should i take the value of h =12 ..taking this I am not getting the answer..
Please suggest
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Re: What is the angle between the minute and the hour hand of the clock wh [#permalink]
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such questions are asked on GMAT? I have never encountered this type in OG, gmatprep or any other test prep material
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Re: What is the angle between the minute and the hour hand of the clock wh [#permalink]
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ritula wrote:
What is the angle between the minute and the hour hand of the clock which shows 12:24?

A. 115
B. 120
C. 124
D. 130
E. 132

M12-26


What is the angle between the minute and the hour hand of the clock which shows 12:24?

A. 115
B. 120
C. 124
D. 130
E. 132

From the position of hands on 12:00 (both hands are vertical) hour hand moves \(\frac{360}{12*60}=0.5\) degrees in 1 minute and minute hand moves \(\frac{360}{60}=6\) degrees in 1 minute.

Hence at 12:24, after 24 minutes from 12:00, when both hands are vertical, hour hand will move \(24*0.5=12\) degrees from the vertical position and minute hand will move \(24*6=144\) degrees from vertical position.

So the angle between them will be \(144-12=132\) degrees.


Answer: E
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Re: What is the angle between the minute and the hour hand of the clock wh [#permalink]
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This Q reminds me of good old school days.

Formula for included angle between minute hand and a hour hand = 11/2m - 30h

Since the hour hand is at 12 , we have h =0

Putting the values in formula above

11/2 * 24 - 0 = 132 Option E
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Re: What is the angle between the minute and the hour hand of the clock wh [#permalink]
[quote="ritula"]What is the angle between the minute and the hour hand of the clock which shows 12:24?

A. 115
B. 120
C. 124
D. 130
E. 132

24-(0+24/12)=22
22*6°=132°
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Re: What is the angle between the minute and the hour hand of the clock wh [#permalink]
Bunuel wrote:
KocharRohit wrote:
I read somewhere there is a direct formula to solve this question..2)
Angle between m and h hand is ( 11/2) *m – 30 * h
can this be apply here? if yes should i take the value of h =12 ..taking this I am not getting the answer..
Please suggest


You just should substitute h=0 in it, not h=12.

General formula is:

\(|\frac{11}{2}m - 30h|\)

If the result is greater than 180 degrees, subtract it from 360 to get the included angle.

The above can be derived from the fact that:
In 1 minute:
Hour hand moves 0.5 degrees,
Minute hand moves 6 degrees.

AND

In an hour:
Hour hand moves 30 degrees,
Minute hand moves 360 degrees.

Hope it's clear.


Please can anyone elaborate on when to assign positive and negative signs when opening the modulus in the general formula given above?

Thanks
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Re: What is the angle between the minute and the hour hand of the clock wh [#permalink]
Expert Reply
WilDThiNg wrote:
Bunuel wrote:
KocharRohit wrote:
I read somewhere there is a direct formula to solve this question..2)
Angle between m and h hand is ( 11/2) *m – 30 * h
can this be apply here? if yes should i take the value of h =12 ..taking this I am not getting the answer..
Please suggest


You just should substitute h=0 in it, not h=12.

General formula is:

\(|\frac{11}{2}m - 30h|\)

If the result is greater than 180 degrees, subtract it from 360 to get the included angle.

The above can be derived from the fact that:
In 1 minute:
Hour hand moves 0.5 degrees,
Minute hand moves 6 degrees.

AND

In an hour:
Hour hand moves 30 degrees,
Minute hand moves 360 degrees.

Hope it's clear.


Please can anyone elaborate on when to assign positive and negative signs when opening the modulus in the general formula given above?

Thanks


You should take the absolute value of \(\frac{11}{2}m - 30h\), so if \(\frac{11}{2}m - 30h\) is negative you should make it positive.
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Re: What is the angle between the minute and the hour hand of the clock wh [#permalink]
thanks for clarifying
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Re: What is the angle between the minute and the hour hand of the clock wh [#permalink]
ritula wrote:
What is the angle between the minute and the hour hand of the clock which shows 12:24?

A. 115
B. 120
C. 124
D. 130
E. 132


24-(24/12)=22 minutes difference
22*6=132°
E
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Re: What is the angle between the minute and the hour hand of the clock wh [#permalink]
ritula wrote:
What is the angle between the minute and the hour hand of the clock which shows 12:24?

A. 115
B. 120
C. 124
D. 130
E. 132

M12-26


Hi Ritula

Good question here. Doubt if one should expect this kind of question in GMAT.

Nevertheless, lets try to solve this question.

Degrees of movement by minute hand in 24 minutes:
\(\frac{24}{60}\) x 360
= 144 degrees

Given that hour hand moves 30 degrees in 60 minutes,
Degrees of movement by hour hand in 24 minutes:
\(\frac{24}{60}\) x 30
= 12

Thus angle between hour and minute hand = 144 - 12
=132 degrees

Answer (E)

Is there anything you would like me to clarify further?
All the best!!!
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Re: What is the angle between the minute and the hour hand of the clock wh [#permalink]
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I like this question.

24 minutes / 60 minutes = 2/5 ---> 2/5 x 360 = 144 ---> 144/360 is the amount of rotation that the minute hand has accomplished

360/12 = 30 degrees <--- This is the amount of degrees that each hour takes up in the circle.

2/5 x 30 = 12 <---This is the amount of rotation that the hour hand has finished

144 - 12 = 132

Answer is E.
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Re: What is the angle between the minute and the hour hand of the clock wh [#permalink]
Minute moves 24/60 = 4/10
Hour moves 4/10 * 1/12 = 4/120

48/120 - 4/120 = 44/120

44/120 * 360 = 44*3*120 / 120 = 132

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Re: What is the angle between the minute and the hour hand of the clock wh [#permalink]
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Solution:
In 1 hour ( 60 mins), A minute hand covers 360°
i.e minute hand moves 6 ° in every 1 minute

Similarly, in 12 hours, the hour hand moves 360°
==> in 1 hour , hour hand moves 360/12 = 30 °
i.e in 1 minute, the hour hand will move 30/60 = 1/2 °

At 12:24, 24 minutes past 12.
in 24 mins, the minute hand moves 24* 6 = 144 °
The hour hand will move 24*1/2 = 12° in 24 mins

So the angle between the minute and the hour hand of the clock will be 144- 12 = 132 °
Option E is the answer.

Thanks,
Clifin J Francis
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