Aptitude - Clock - Discussion
Discussion Forum : Clock - General Questions (Q.No. 5)
5.
How much does a watch lose per day, if its hands coincide every 64 minutes?
Answer: Option
Explanation:
55 min. spaces are covered in 60 min.
| 60 min. spaces are covered in |  |
60 | x 60 |  min. |
= 65 | 5 | min. |
| 55 | 11 |
| Loss in 64 min. = | |
65 | 5 | - 64 | |
= | 16 | min. |
| 11 | 11 |
| Loss in 24 hrs = | |
16 | x | 1 | x 24 x 60 | min. |
= | 32 | 8 | min. |
| 11 | 64 | 11 |
Discussion:
119 comments Page 10 of 12.
Vijeshri said:
9 years ago
@Krishna
64 * 11= 704.
720 - 704/11 = 16/11.
64 * 11= 704.
720 - 704/11 = 16/11.
Anonymous said:
9 years ago
I didn't understand. Please clarify me.
Vishal said:
9 years ago
Well done @Konxie.
ROHIT DUBEY said:
9 years ago
Please solve it by the tricky method.
Chetan minajigi said:
9 years ago
Thanks @Maddy.
Ramu said:
9 years ago
Thanks for explaining the answer.
Amit Kumar said:
9 years ago
I think the clock is gaining time. Because, instead of meeting after 65 5/11, it is meeting in 64 minutes only. Hence the question, "what time it looses is wrong".
Anand Moghe said:
9 years ago
I think the question is incorrect.
It is like this: A correct clock will have a time gap of (720/11 = 65 and 5/11) minutes between two successive overlaps of the hours hand and the minute hand. IF this time is being covered by the incorrect clock in 64 minutes (64 < 65 5/11), then the incorrect clock is gaining time, not losing time. What should have been covered in 65 5/11 mins is now being covered in 64 mins.
Thus the time gained in 65 5/11 minutes is 1 5/11 minutes (=16/11). So the time gained in 24 hrs (1440 minutes) is (1440 * (16/11) * (11/720) = 32 mins.
I believe when the incorrect clock covers a specified (correct) time in lesser (incorrect) time, then the incorrect clock is gaining time.
The answer must be : clock gains time of 32 mins per day.
It is like this: A correct clock will have a time gap of (720/11 = 65 and 5/11) minutes between two successive overlaps of the hours hand and the minute hand. IF this time is being covered by the incorrect clock in 64 minutes (64 < 65 5/11), then the incorrect clock is gaining time, not losing time. What should have been covered in 65 5/11 mins is now being covered in 64 mins.
Thus the time gained in 65 5/11 minutes is 1 5/11 minutes (=16/11). So the time gained in 24 hrs (1440 minutes) is (1440 * (16/11) * (11/720) = 32 mins.
I believe when the incorrect clock covers a specified (correct) time in lesser (incorrect) time, then the incorrect clock is gaining time.
The answer must be : clock gains time of 32 mins per day.
Sushma said:
8 years ago
I am not understanding this question. Please, anybody explain me.
Surjeet Murmu said:
8 years ago
Here, I think there will be gain in time. Not a loss in time.
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