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 5 of 8.
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).
Vip said:
1 decade ago
Thanks! abhiram.
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.
Ajay said:
1 decade ago
Yes @shree I have same prob that how we use theta value.
Dinesh said:
1 decade ago
Thank you Reddilavan.
Naresh said:
1 decade ago
@red
You are great
You are great
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
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.
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
Arjun said:
1 decade ago
What is right angle?
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