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.
Lakhan singh meena said:
9 years ago
Direct formula:
6*x - 90 = 30(y + x/60);
Where y = 5 hr.
So 6x = 30(5 + x/60) + 90;
x = 43(7/11)min. past 5.
6*x - 90 = 30(y + x/60);
Where y = 5 hr.
So 6x = 30(5 + x/60) + 90;
x = 43(7/11)min. past 5.
Prashanth said:
10 years ago
If the minute hand is present before hour hand then use theta = 11/2min-30hr.
Like that hour hand is before minute hand theta = 30hr-11/2hr.
Use it you will get exact solution.
Like that hour hand is before minute hand theta = 30hr-11/2hr.
Use it you will get exact solution.
Adi said:
10 years ago
Dear sir,
Please prove formula.
Please prove formula.
Abc said:
10 years ago
Superb formula. Thanks alot.
Nagu said:
10 years ago
Why the spaces are same for 5'clock and 7'clock == 25 spaces?
In which direction we have to take the spaces clock wise or anti clock wise?
In which direction we have to take the spaces clock wise or anti clock wise?
Krish said:
1 decade ago
I have the same doubt as @Margaret said. Please anyone explain it.
Ranjeesh said:
1 decade ago
@Reddilavan your formula is ok. But why are you take only the number 5 in our west. Time give 5.30. Any one can explain?
Jonas palmiano said:
1 decade ago
What time after 4 o'clock will the hands of the clock be at right angle? Please help.
A v said:
1 decade ago
@Aaaa.
Because hour hand will move too as 40 mins passes by. Thereby, no chance to get an exact 90 ° formation between hands.
Because hour hand will move too as 40 mins passes by. Thereby, no chance to get an exact 90 ° formation between hands.
Aaaa said:
1 decade ago
If 40 past 5 makes 90 degrees why isn't that the answer?
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