Aptitude - Clock - Discussion
Discussion Forum : Clock - General Questions (Q.No. 7)
7.
At what time between 5.30 and 6 will the hands of a clock be at right angles?
Answer: Option
Explanation:
At 5 o'clock, the hands are 25 min. spaces apart.
To be at right angles and that too between 5.30 and 6, the minute hand has to gain (25 + 15) = 40 min. spaces.
55 min. spaces are gained in 60 min.
| 40 min. spaces are gained in |  |
60 | x 40 |  min |
= | 43 | 7 | min. |
| 55 | 11 |
 Required time = 43 |
7 | min. past 5. |
| 11 |
Discussion:
76 comments Page 2 of 8.
Madhu said:
1 decade ago
A right angle is an angle that bisects the angle formed by two halves of a straight line is called right angle and the angle between the two halves is 90 degrees. In the given problem handles of clock are in right angle so we take 90 degrees angle.
Siri said:
1 decade ago
Acc to formula in 60 min we gain 55 spaces
So, for 1min = ?
60min=55 gains
1min=?
so by cross multiplicatn
we get
60/1x55=60/55
So, for 1min = ?
60min=55 gains
1min=?
so by cross multiplicatn
we get
60/1x55=60/55
Abhiram said:
1 decade ago
@Akki, The given question is hands must be in right angles so 90 degrees is taken.
@Shree, You can take any f the formula but take care not to get a -ve theta if it comes -ve then take another formula ts as simple as such.
@Shree, You can take any f the formula but take care not to get a -ve theta if it comes -ve then take another formula ts as simple as such.
Deepika said:
1 decade ago
There is a direct formula for it...
30xH + 11/2xM where H is for hours and M is minutes..
for e.g. in 4.20 pm....
H= 4
M= 20
30xH + 11/2xM where H is for hours and M is minutes..
for e.g. in 4.20 pm....
H= 4
M= 20
Naresh said:
1 decade ago
@red
You are great
You are great
Dinesh said:
1 decade ago
Thank you Reddilavan.
Ajay said:
1 decade ago
Yes @shree I have same prob that how we use theta value.
Palikila Sridevi said:
1 decade ago
Please explain me briefly how.
"55 min. Spaces are gained in 60 min" came.
"55 min. Spaces are gained in 60 min" came.
Vip said:
1 decade ago
Thanks! abhiram.
Susmitha said:
1 decade ago
In 1 hour a minute hand covers 60 minute divisions (minute spaces) where as an hour hand covers only 5 minute divisions in 1 hour. Thus minute hand gains 55 (i. e;60-5) minute divisions in 60 minutes (1 hour).
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers