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# Aptitude - Clock - Discussion

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"Weakness of attitude becomes weakness of character."
- Albert Einstein
12.

The angle between the minute hand and the hour hand of a clock when the time is 8.30, is:

 [A]. 80º [B]. 75º [C]. 60º [D]. 105º

Explanation:

 Angle traced by hour hand in 17 hrs = 360 x 17 º = 255. 2 12 2

 Angle traced by min. hand in 30 min. = 360 x 30 º = 180. 60

Required angle = (255 - 180)º = 75º.

 Deep said: (Sat, Jun 12, 2010 10:55:01 AM) How 17/2 came please anyone answer?

 Prasad said: (Mon, Jun 21, 2010 01:39:27 AM) 17/2 = 8.5 but 8hr 30min, so how it's came 17/2 ? Why we use this? can any one tell me please?

 Sundar said: (Mon, Jun 21, 2010 02:01:26 AM) Hi @ALL We can write 8.30 as 17/2 hours. Let me explain. 17/2 = 8.5 = 8 hours + 0.5 hours = 8 hours + 1/2 hours = 8 hours + 1/2 x 60 mins (.: 1 hour = 60 mins, Therefore, 1/2 hours = 30 mins) = 8 hrs 30 min. Therefore, we can write 8-hrs 30-min as 17/2. While solving problems, make all numbers in vulgar fraction, it will be easy to solve problems quickly. For example: 360/12 x 17/2 = ? It is easy to solve. Have a nice day!

 Shekhar Bhakat said: (Fri, Aug 26, 2011 01:07:11 PM) Try this formula it can solve any tipe of clock related problem. Angle b/w two handes of the clock= (11/2) *min-30*hr;.

 Ndd said: (Wed, Sep 21, 2011 12:46:13 PM) 8hr+30/60=17/2.

 Marati Raju said: (Mon, Oct 3, 2011 05:01:21 PM) It is . . . . Very simple by the Formula: 30H-[11/2]M at 8.30 i.e 240-165=75degrees I hope that every one understood this . . . . .

 Nagmani Sinha said: (Thu, Dec 15, 2011 10:58:13 PM) We can use other formula too... 30h-6m where: H=total hours including minute parts... m=minutes in above qn it would be 30*17/2-6*30=255-180=75; Hope its easier formula.

 Suresh said: (Thu, Apr 12, 2012 10:57:01 AM) Hours hand should be calculated by considering hours Hand -( 8 * 360/12)= 240 deg Minutes Hand - ( 30 * 360/60) = 180 deg Total angle b/w Hour and Min = 240 -180 = 60 deg. This is Practically as per the clock system.

 Naveen said: (Sat, May 26, 2012 02:44:09 PM) Can we write 17/2 we also write this 34/4 that is also equals.

 Shoubhick said: (Mon, Sep 17, 2012 03:17:51 AM) Hey guys... no need to apply any formula.. just look at any clock,each division(1/12) is 360/12=30 deg,and 1/24 division is 15 deg,so in 8:30--> 30+30+15=75 deg