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 6 of 8.
Chan said:
1 decade ago
@Amit.
If the hour is equal to 6, then what is the formula for that.
Is it the angle 180 for straight angle and 90 for right angle.
If the hour is equal to 6, then what is the formula for that.
Is it the angle 180 for straight angle and 90 for right angle.
Shubham said:
1 decade ago
Can any one let me know that the angle which we always consider is in clockwise direction or we can consider that in anticlockwise direction too.
Pavansairam said:
1 decade ago
If theta = 90 and you go for 1st(b/w 5.30 to 6.00 etc problems).
If theta = 180 you go for 2nd.
If theta = 180 you go for 2nd.
Amit said:
1 decade ago
@Harry.
Both the formulas are correct.
1st one is used for finding the angle when hour is less than 6.
2nd one is used when the hour is more than 6.
Both the formulas are correct.
1st one is used for finding the angle when hour is less than 6.
2nd one is used when the hour is more than 6.
Harry said:
1 decade ago
@Reddilavan Can you please explain how to decide the exact formula
1) angle=(11/2)*min-30*hr
2) angle=30*hr-(11/2)*min
Which formula is correct ?
1) angle=(11/2)*min-30*hr
2) angle=30*hr-(11/2)*min
Which formula is correct ?
Arjun said:
1 decade ago
What is right angle?
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.
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