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 7 of 8.
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.
Ragav said:
7 years ago
Why we can't use 30H - 5.5H = 90 formula?
30(11/2) - 5.5H = 90.
30(11/2) - 5.5H = 90.
(1)
Sonam said:
7 years ago
Can you explain me the calculation of 43 7/11 min how it comes from (60/55*40) min?
(1)
Dipankar Mondal said:
6 years ago
40 * 12/11 = 43 7/11.
(3)
Swathi sayyapureddy said:
6 years ago
@Shree.
When hour hand is preceding minute hand then theta=30H~11M/2 will be used otherwise, means when min hand is preceding hour hand then theta=11M/2~30H can be used.
When hour hand is preceding minute hand then theta=30H~11M/2 will be used otherwise, means when min hand is preceding hour hand then theta=11M/2~30H can be used.
(4)
Ajay said:
6 years ago
Thank @Ajay.
ABI said:
5 years ago
55min spaces are gained in 60min. What it is, Can someone explain to me this?
(1)
Babu said:
5 years ago
55min spaces are gained in 60min. What it is, Can someone explain to me?
(4)
Diksha Mishra said:
5 years ago
Please, someone, share the solution of how come40*60÷55 = 7÷11 came ? Pls someone explain it..
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