Aptitude - Clock - Discussion
Discussion Forum : Clock - General Questions (Q.No. 19)
19.
A watch which gains uniformly is 2 minutes low at noon on Monday and is 4 min. 48 sec fast at 2 p.m. on the following Monday. When was it correct?
Answer: Option
Explanation:
Time from 12 p.m. on Monday to 2 p.m. on the following Monday = 7 days 2 hours = 170 hours.
 The watch gains |
 |
2 + 4 | 4 |  min. |
or | 34 | min. in 170 hrs. |
| 5 | 5 |
| Now, | 34 | min. are gained in 170 hrs. |
| 5 |
| 2 min. are gained in |
|
170 x | 5 | x 2 | hrs |
= 50 hrs. |
| 34 |
Watch is correct 2 days 2 hrs. after 12 p.m. on Monday i.e., it will be correct at 2 p.m. on Wednesday.
Discussion:
56 comments Page 5 of 6.
Parul arora said:
1 decade ago
Why 2 p.m. on Wednesday?
Vivek gupta said:
1 decade ago
@Vinesh.
The Clock was 2 minute late on Monday noon. ok.
Again it found 4 min and 48 sec fast on next Monday 2 p.m.
Means clock was gaining continuously, from Monday noon to next Monday 2 p.m.
Hence total gain = 2 min +4 min and 48 sec.
The Clock was 2 minute late on Monday noon. ok.
Again it found 4 min and 48 sec fast on next Monday 2 p.m.
Means clock was gaining continuously, from Monday noon to next Monday 2 p.m.
Hence total gain = 2 min +4 min and 48 sec.
Kumar said:
1 decade ago
How to covert 2 min + 4 min and 48 sec by using how to covert 34/5 or 44/5?
Please explain clearly.
Please explain clearly.
Kanika said:
2 decades ago
pls explain again the whole ans i didnt get it
Shree said:
1 decade ago
How to covert 2min+4min 48 sec into 34/5. I am getting it as 26/5? Explain it clearly.
Ariella said:
1 decade ago
@ Rajesh.
Given that the said watch was 2 minutes low at Monday noon. Hence when it gained 2 minutes, The time was correct.
Given that the said watch was 2 minutes low at Monday noon. Hence when it gained 2 minutes, The time was correct.
Ayushee said:
10 years ago
A watch which "gains" uniformly is 2 minutes low at noon.
Since, gain word is used hence we will add on all the gains (i.e 2+4 min 48 sec = which turns on to be 24/5 min).
Total gain=> 2+24/5 = 34/5 min.
Hence, 34/5 mins are gained in 170 hrs (7*24+2).
Then, 2 mins will be gained in x hrs.
We get x hrs = 50 hrs (from cross multiplying above two equations).
Now, 2 mins are gained in 50 hrs which can be written as 2*24+2 (i.e 2 days and 2 hrs).
After Monday if we calculate 2 days and 2 hrs we get Wednesday and 2 hrs which is the answer to the question.
Cheers!
Since, gain word is used hence we will add on all the gains (i.e 2+4 min 48 sec = which turns on to be 24/5 min).
Total gain=> 2+24/5 = 34/5 min.
Hence, 34/5 mins are gained in 170 hrs (7*24+2).
Then, 2 mins will be gained in x hrs.
We get x hrs = 50 hrs (from cross multiplying above two equations).
Now, 2 mins are gained in 50 hrs which can be written as 2*24+2 (i.e 2 days and 2 hrs).
After Monday if we calculate 2 days and 2 hrs we get Wednesday and 2 hrs which is the answer to the question.
Cheers!
Amsa said:
10 years ago
Please anyone explain what is the meaning for this question?
Rahul said:
10 years ago
How it is 85/204?
Ayush aryan said:
9 years ago
Great explanations. Thank you all.
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