Aptitude - Clock - Discussion
Discussion Forum : Clock - General Questions (Q.No. 4)
4.
A watch which gains 5 seconds in 3 minutes was set right at 7 a.m. In the afternoon of the same day, when the watch indicated quarter past 4 o'clock, the true time is:
Answer: Option
Explanation:
| Time from 7 a.m. to 4.15 p.m. = 9 hrs 15 min. = | 37 | hrs. |
| 4 |
3 min. 5 sec. of this clock = 3 min. of the correct clock.
 |
37 | hrs of this clock = | 1 | hrs of the correct clock. |
| 720 | 20 |
| |
37 | hrs of this clock = |  |
1 | x | 720 | x | 37 |  |
hrs of the correct clock. |
| 4 | 20 | 37 | 4 |
= 9 hrs of the correct clock.
The correct time is 9 hrs after 7 a.m. i.e., 4 p.m.
Discussion:
154 comments Page 14 of 16.
Vinay Chik Baraik said:
8 years ago
It's given that error clock gains 5 seconds in each 3 minutes of perfect clock.
So, 3min 5sec of error clock = 3min of perfect clock.
Or, [3+(5/60)] min of error clock = 3min of perfect clock. (185s of error clock = 180s perfect clock)
Or, (37/12) min of error clock = 3min of perfect clock
Or 1 min of error clock = 3*12/37 min of perfect clock =36/37.
Now error clock moved from 7am to 4:15pm = 9hr 15min = ( 9*60 + 15 )min = 555min.
So in 555 min of error clock = (36/37)*555 min of perfect clock = 540min of perfect clock.
= (540/60) hr = 9 hr of perfect clock.
So 9hr from 7am is 4pm. Thus the answer is [B] 4 p.m.
So, 3min 5sec of error clock = 3min of perfect clock.
Or, [3+(5/60)] min of error clock = 3min of perfect clock. (185s of error clock = 180s perfect clock)
Or, (37/12) min of error clock = 3min of perfect clock
Or 1 min of error clock = 3*12/37 min of perfect clock =36/37.
Now error clock moved from 7am to 4:15pm = 9hr 15min = ( 9*60 + 15 )min = 555min.
So in 555 min of error clock = (36/37)*555 min of perfect clock = 540min of perfect clock.
= (540/60) hr = 9 hr of perfect clock.
So 9hr from 7am is 4pm. Thus the answer is [B] 4 p.m.
Shashi said:
8 years ago
There is no coincidence between 11 &12 hence only 11 coincidence per 12 hours.
Totally 22 coincidence per day,
Hence answer is 32.
Totally 22 coincidence per day,
Hence answer is 32.
Binoy saha said:
8 years ago
9 hrs 15 min. = 37/4 hrs? How please explain.
Binoy Saha said:
8 years ago
3 mins clock gains 5 sec mean? Please explain it.
Kamlesh said:
8 years ago
@Sundar.
Your explanation is in a very simple way. Thanks.
Your explanation is in a very simple way. Thanks.
Jose said:
7 years ago
How to solve 555/60 = 37/4?
Mayuri madavi said:
7 years ago
Find the ratio 15 sec, 1 min. Please explain this question.
Abhishek said:
7 years ago
Total 555min,
5 sec for 3 mins,
so total 925 sec increase,
i.e. 15mins 25 sec.
time is 4:15.
So corrected time 3 hrs 59 mins 45 secs.
5 sec for 3 mins,
so total 925 sec increase,
i.e. 15mins 25 sec.
time is 4:15.
So corrected time 3 hrs 59 mins 45 secs.
Ankit said:
7 years ago
3: 5 Sec (wrong Clock) = 3 min ( Right Clock).
Now convert 3:5 Sec into min = 3+(5/60)== 37/12 min.
37/12 min will be === to 3 min of wrong clock.
1min of wrong clock will be = 3*12/37 = 36/37min of right clock.
9:15 min will be of wrong clock ==36/37*555 ( Total time trvel = 9:15min =555min) of right clock.
= 19980/37.
= 540min.
= 9 hrs = 4 PM.
Thanks.
Now convert 3:5 Sec into min = 3+(5/60)== 37/12 min.
37/12 min will be === to 3 min of wrong clock.
1min of wrong clock will be = 3*12/37 = 36/37min of right clock.
9:15 min will be of wrong clock ==36/37*555 ( Total time trvel = 9:15min =555min) of right clock.
= 19980/37.
= 540min.
= 9 hrs = 4 PM.
Thanks.
Adharsh said:
7 years ago
Hi, I am not getting this. Please, anyone explain me to get this.
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