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# Aptitude - Clock - Discussion

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"Weakness of attitude becomes weakness of character."
- Albert Einstein
1.

An accurate clock shows 8 o'clock in the morning. Through how may degrees will the hour hand rotate when the clock shows 2 o'clock in the afternoon?

 [A]. 144º [B]. 150º [C]. 168º [D]. 180º

Explanation:

 Angle traced by the hour hand in 6 hours = 360 x 6 º = 180º. 12

 Reddi Lavan said: (Fri, Oct 29, 2010 01:01:36 PM) 60'=360 deg then 12 hrs=360 deg 12-60 6 - ? = (60*6)/12=180 deg

 Rudra said: (Wed, Dec 29, 2010 05:02:25 AM) Angle = mod(5.5*2m - 30*h); where m=minute, h=hour;

 Maran said: (Fri, Jan 28, 2011 07:25:21 AM) Please yet I need to clear explanation.

 Murugan said: (Fri, Feb 4, 2011 04:27:13 PM) Clock is consider as circle 360 deg the duration of Time= 6 hrs total = 12 hrs calculated deg=time duration*deg/total hrs =6(360/12)=180

 Rishi said: (Tue, Feb 8, 2011 08:20:18 AM) HEY MARAN...HERE IS A ONE MORE METHOD 2 SOLVE DIS... SEE WE HAVE TO FIND THE DEGREE @ 2p.m. 1 HR=30 DEGREES SO THE GAP TIME BETWEEN 8a.m. to 2p.m. IS 6 HRS... SO 6*30=180 DEGRESS... I HOPE U UNDERSTOOD....

 Shah Idris said: (Fri, Apr 1, 2011 02:43:19 AM) I think rishi has cleared my problem confusion.

 Chandu said: (Mon, Apr 25, 2011 07:32:16 AM) Rishi explanation is good. It is understood by every one easily.

 Asif said: (Wed, Jun 1, 2011 01:03:27 AM) Thanks Rishi.

 Saurabh said: (Wed, Jun 8, 2011 02:04:40 PM) Rishi ....Thnks u gave a good explanation

 Senthil said: (Wed, Jul 20, 2011 10:50:47 PM) Each hour takes 180 degree to rotate. That's very simple concept each clock takes a complete rotation to complete an hour. So one complete rotation denotes the angle of 180 degree.

 Vinu said: (Sun, Jul 24, 2011 01:10:09 AM) Rishi. Good solution.

 Chandraprakash said: (Fri, Aug 26, 2011 12:28:45 AM) Sethil ji you are wrong. A complete rotation means 360 degree. & 2 o 'clock comes its half as in 6 position. So ans is 360/2=180 degree simple.

 Vinoth said: (Thu, Sep 29, 2011 09:36:15 PM) A Clock strikes every hour-once at 1.00, twice at 2.00, and so on. The clock takes 6 seconds to strike 5.00 and 12 seconds to strike 9.00. the time needed to strike 1.00 is negligible. How long does the clock need for all its striking in 24 hours? a)168 Seconds b)178 Seconds c)188 Seconds d) 198 Seconds How to solve this question?

 Adityagenius said: (Mon, Dec 5, 2011 03:46:59 AM) 198 seconds to cover up 4 intervals=6seconds 1 gap=1.5 sec 2*(1.5+3.0+4.5+6+7.5+9+10.5+12+13.5+15+16.5+0)=198 seconds as first interval takes 0 second 5-1 take 6 seconds 6/4= 1.5

 Sujeet Pandey said: (Mon, Jan 30, 2012 02:36:48 PM) Thanks Rishi

 Vani said: (Wed, Feb 8, 2012 01:19:51 PM) Rishi had given very good explanation.

 Rupa said: (Fri, Mar 2, 2012 11:43:51 AM) No Rishi. this solution is not good for all problems. because just think when we have to find angle between 1'o clock and 3'o clock which angle you will consider? 1-3 or 3-1 ? if 1 to 3 the angle is 60 degrees if 3 to 1 the angle is 300 degrees Am I right?

 Prerna167 said: (Thu, Mar 8, 2012 03:50:24 PM) Hey rishi can you explain that how 1hr = 30 degree.

 Lavanya said: (Tue, May 29, 2012 02:03:28 PM) Hi guys, I don't know proper rules & how to calculate ? Please tel me any solutions about clocks problems.

 Sandesh said: (Sat, Jun 16, 2012 05:38:26 PM) 1hr = 30 degree. 6hrs degree = 30*6 = 180.

 Priyanka Prasad said: (Sun, Jun 17, 2012 10:46:01 AM) 5min = 30dg (degree). 1min = 6dg. If min 6 dg = hr 1/2 dg. So angle between hr and min hand is 6*30 = 180dg. Now from 12, hr hand is shifted and we have to call that shift. So from 12, min hand is 25 min. So 25*1/2 = 17.5dg. Now 180+17.5dg = 197.5dg.

 Jyoti said: (Sat, Sep 1, 2012 07:36:07 PM) Thnks rishi your explanation is very easy.

 Cheenu said: (Fri, Dec 21, 2012 10:45:29 PM) How to apply theta = 30h-(11/2)m in this question. Can we apply those in every question?

 Manoj said: (Sat, Jun 1, 2013 12:08:59 PM) Min hand take 60 min for complete 360 degree. So 1 min = 360/60. 1 min = 6 degree. Hour hand take 12 hours to complete 360 degree. So 1 min = 360/ (60*12). 1 min = 0.5 degree. So 8'o clk - 2'o clk = 6 hrs, 1 hour = 0.5*60 = 30 degree. So 6 hour = 6*30 = 180 degree.