Aptitude - Clock - Discussion
Discussion Forum : Clock - General Questions (Q.No. 2)
2.
The reflex angle between the hands of a clock at 10.25 is:
Answer: Option
Explanation:
| Angle traced by hour hand in | 125 | hrs = |  |
360 | x | 125 |  |
° | = 312 | 1 | ° | . |
| 12 | 12 | 12 | 2 |
| Angle traced by minute hand in 25 min = | |
360 | x 25 | |
° | = 150°. |
| 60 |
 Reflex angle = 360° - |
|
312 | 1 | - 150 | |
° | = 360° - 162 | 1 | ° | = 197 | 1° | . |
| 2 | 2 | 2 |
Discussion:
269 comments Page 14 of 27.
Ravi said:
1 decade ago
Here they had given time is 10:25.
Angle = (11/2(minutes)-30(hours)).
Angle = (11/2(25)-30(10)).
Angle = (137.5-300).
Angle = 162.5.
Ref angle = 360-162.5 = 197.5.
Angle = (11/2(minutes)-30(hours)).
Angle = (11/2(25)-30(10)).
Angle = (137.5-300).
Angle = 162.5.
Ref angle = 360-162.5 = 197.5.
Navnath Dombale said:
1 decade ago
How to calculate angle?
Simple solution. Take an example.
We know when hrs &min hands on 12.00 after that min hand covers 60 min then hrs hand on 1:00.
So in 60 min hrs hand cover 30 degree. So 60 m = 30° so 1 m = 0.5 °
Simple solution. Take an example.
We know when hrs &min hands on 12.00 after that min hand covers 60 min then hrs hand on 1:00.
So in 60 min hrs hand cover 30 degree. So 60 m = 30° so 1 m = 0.5 °
Navnath Dombale said:
1 decade ago
Please read. Its important I'm Navnath Dombale.
Simply 10:25 means angle covered in 25 m = 12.5° (after 60 m = 30°.
For example if both hands started 12:00 then after 60 m hrs hands reaches at 1:00. So in 60 m = 30°.
So 1 m = 0.5°.
25 m means min it hand on 5. So difference in angle is (5-6-7-8-9-10 = 5 hrs angle = 150°+12.5° = 162.5°.
Reflect angle = 360°-162.5° = 197.5°.
Ans = 197.5°.
Simply 10:25 means angle covered in 25 m = 12.5° (after 60 m = 30°.
For example if both hands started 12:00 then after 60 m hrs hands reaches at 1:00. So in 60 m = 30°.
So 1 m = 0.5°.
25 m means min it hand on 5. So difference in angle is (5-6-7-8-9-10 = 5 hrs angle = 150°+12.5° = 162.5°.
Reflect angle = 360°-162.5° = 197.5°.
Ans = 197.5°.
Vinod kr said:
1 decade ago
30*6=180.
25/2=12.5.
30-12.5=17.5.
180+17.5=197.5 or 197-1/2.
One more example:
3.40 or 15.40 min = ? degree angle.
30*4=120.
40/2=20.
30-40=10.
120+10=130.
Exp 12.20 min.
30*3=90.
20/2=10.
30-10=20.
90+20=110.
25/2=12.5.
30-12.5=17.5.
180+17.5=197.5 or 197-1/2.
One more example:
3.40 or 15.40 min = ? degree angle.
30*4=120.
40/2=20.
30-40=10.
120+10=130.
Exp 12.20 min.
30*3=90.
20/2=10.
30-10=20.
90+20=110.
Pragna said:
1 decade ago
Will you explain me in a simple way?
Pragna said:
1 decade ago
Is there any alternate method to solve this problem?
Malli Reddy said:
10 years ago
In general the reflex angle b/n hours hand at 10 and minutes hand at 25 is 210.
But movement of min hand by 25 causes hours hand to move.
12.5 degrees forward (reason:for every min min hand moves 6 degrees causing hours hand 1/2 degree if you don't know this have a clear idea about clocks).
So, subtract 12.5 from 210.
210-12.5 = 197.5.
That's it.
But movement of min hand by 25 causes hours hand to move.
12.5 degrees forward (reason:for every min min hand moves 6 degrees causing hours hand 1/2 degree if you don't know this have a clear idea about clocks).
So, subtract 12.5 from 210.
210-12.5 = 197.5.
That's it.
Vinod said:
10 years ago
I don't understand this question please help me.
Naresh said:
10 years ago
Time is 10:25.
Formula = (11/2 (minutes) - 30 (hours)).
(11/2 (25) - 30 (10)).
= 162.5.
RA is 360 - 162.5 = 197.5.
Formula = (11/2 (minutes) - 30 (hours)).
(11/2 (25) - 30 (10)).
= 162.5.
RA is 360 - 162.5 = 197.5.
Md asjad said:
10 years ago
I could not understand the reflex angle.
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