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 7 of 27.
Bhavana said:
1 decade ago
I cannot understand how to calculate 125/12
Durga said:
1 decade ago
Here we have given 10.25
=>the hour hand will rotate 10 hrs and 25 minute
But we know that 60minute =1hr
so 1min=1/60hrs
25 min=25/60=5/12 hrs.........................................(1)
the hour hand covered 10 hrs and 25 minute
So total hour covered=
10+5/12 hrs {from equation 1}
=(120+5)/12
=125/12
=>the hour hand will rotate 10 hrs and 25 minute
But we know that 60minute =1hr
so 1min=1/60hrs
25 min=25/60=5/12 hrs.........................................(1)
the hour hand covered 10 hrs and 25 minute
So total hour covered=
10+5/12 hrs {from equation 1}
=(120+5)/12
=125/12
Madhu said:
1 decade ago
Even I wanted to know why hte reflex angle is calculated as 125/12.
Sisi said:
1 decade ago
Vasuroshan explasnation is good but I have a doubt if the angle is lessthan 180 then sub it from 360 ok. But if the angle is graterthan 180 then what is the solution. Please tel me.
Alex said:
1 decade ago
30H-(11/2)M where H----Hours
M----Minutes..
How do you use this formula to calculate the angle when the clock is showing 3:25?
M----Minutes..
How do you use this formula to calculate the angle when the clock is showing 3:25?
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°
Sowmia said:
1 decade ago
Vasuroshan answer is very simple and well undestandable but please tel me one thing if the angle is graterthan 180 then what we should do?
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
Indu said:
1 decade ago
In reflex formula how you get 11/2? Please tell me.
Angu said:
1 decade ago
@ Shreekanth. Thank you.
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers