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 4 of 8.
Arpita Saxena said:
8 years ago
I didn"t understand this solution. Can anyone please explain?
Jeet said:
8 years ago
At 5.30, Angle between hands is 15 degree and 75' more required to make a right angle. Relative angle made by hands is 11/2 ' in a minute.
We can assume in x min they cover remaining 75.
So 11/2 * x = 75.
x = 150/11 min.
So at 30 + 150/11 min, they make a right angle.
We can assume in x min they cover remaining 75.
So 11/2 * x = 75.
x = 150/11 min.
So at 30 + 150/11 min, they make a right angle.
Vijaya said:
8 years ago
I don't understand how, 15 m gain? please anyone explain it.
Saravana said:
8 years ago
How the calculation (60\55)*40 = 43*7/11?
Siddharth Pandey said:
7 years ago
Tell me both the times at which der will be 90-degree b/w min hand and second hand between 1 AM/PM to 2 AM/PM using the formula mentioned above. Does this formula work for given timings?
Saidul said:
7 years ago
Thanks @Harry.
Ajay said:
6 years ago
Thank @Ajay.
Diksha Mishra said:
5 years ago
Please, someone, share the solution of how come40*60÷55 = 7÷11 came ? Pls someone explain it..
Renuga said:
3 years ago
At what time between 5 and 60' clock the hands of a clock will make an angle of 40%?
Anyone, explain the answer.
Anyone, explain the answer.
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.
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