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 8 of 27.
Jahir said:
1 decade ago
The below angles are defined
Acute angle Less than 90°
Right angle Exactly 90°
Obtuse angle Between 90° and 180°
Straight angle Exactly 180°
Reflex angle Between 180° and 360°
Full angle Exactly 360°
Acute angle Less than 90°
Right angle Exactly 90°
Obtuse angle Between 90° and 180°
Straight angle Exactly 180°
Reflex angle Between 180° and 360°
Full angle Exactly 360°
Varun said:
1 decade ago
Minute hand speed= 6degree/min
thus in 25 minute= 6*25= 150 degree
hour hand speed = 1/2 degree/min
thus in 25 minute= 1/2 * 25= 12.5 degree
thus angle between these two hands= 150+12.5= 162.5 degree
thus reflex anlge= 360-162.5= 197.5 degree
thus in 25 minute= 6*25= 150 degree
hour hand speed = 1/2 degree/min
thus in 25 minute= 1/2 * 25= 12.5 degree
thus angle between these two hands= 150+12.5= 162.5 degree
thus reflex anlge= 360-162.5= 197.5 degree
Vamsi singanapudi said:
1 decade ago
In a clear manner to explain about 125/12 is for 10 the angle is 10*30 = 300.
That is hours hand cover 30 degrees in one hour duration.
In the same way within 25 minutes it cover ((30/12) *5 = 12.5).
So that the angle is 312.5 degrees.
That is hours hand cover 30 degrees in one hour duration.
In the same way within 25 minutes it cover ((30/12) *5 = 12.5).
So that the angle is 312.5 degrees.
M Satheesh said:
1 decade ago
Short hand or hour hand = 360/12 = 30
Long hand or minute hand= 360/60 = 6
When 10.25 is the short hand in the clock then 10x30=300 and 25x30/60=12.5
Adding this 300+12.5=312.5
When 25 minute long hand is 25x6=150
=360-[312.5-150]=197.5.
Long hand or minute hand= 360/60 = 6
When 10.25 is the short hand in the clock then 10x30=300 and 25x30/60=12.5
Adding this 300+12.5=312.5
When 25 minute long hand is 25x6=150
=360-[312.5-150]=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 °
Bharath said:
1 decade ago
Reflex angle = 360-(angle between).
Angle between = (30*hour)-((11*minute)/2).
= (30*10)-((11*25)/2).
= (300-137(1/2)).
= 162 (1/2).
Reflex angle = 360-(162 (1/2)).
= 197 (1/2).
Angle between = (30*hour)-((11*minute)/2).
= (30*10)-((11*25)/2).
= (300-137(1/2)).
= 162 (1/2).
Reflex angle = 360-(162 (1/2)).
= 197 (1/2).
M Rajeswari said:
1 decade ago
Hi everyone,
It is simple question The reflex angle b/w the hands of a clock at 10.25.
Then formula is 11/2M-30H.
So, we can substitute in this, 11/2(25)-30(10).
=>162.5.
Then, the angle 360-162.5.
=>197.5.
That's it.
It is simple question The reflex angle b/w the hands of a clock at 10.25.
Then formula is 11/2M-30H.
So, we can substitute in this, 11/2(25)-30(10).
=>162.5.
Then, the angle 360-162.5.
=>197.5.
That's it.
Lazy balu said:
7 years ago
@Guru.
Actually for degree calculation |30h-{11(mints)}/2|=======30*10-{(11*25)|/2}.
300-(275)/2.
(600-275)/2.
325/2.
162.1/2.
Then reflected angle = clock angle - actual angle.
360-162.5 = 197.5 this is the correct answer.
Actually for degree calculation |30h-{11(mints)}/2|=======30*10-{(11*25)|/2}.
300-(275)/2.
(600-275)/2.
325/2.
162.1/2.
Then reflected angle = clock angle - actual angle.
360-162.5 = 197.5 this is the correct answer.
Kasinath@Hyd said:
1 decade ago
So simple, to find degrees for a value > 180 or > 6'o clock.
Formula is 1/2 (60*hrs-11*min).
= 1/2(60*10-11*25) ==> 1/2(600-275).
==>162.5.
Since reflex angle i.e., 360 deg.
Therefore 360-162.5 ==> 197.5.
Formula is 1/2 (60*hrs-11*min).
= 1/2(60*10-11*25) ==> 1/2(600-275).
==>162.5.
Since reflex angle i.e., 360 deg.
Therefore 360-162.5 ==> 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.
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