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 13 of 16.
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.
Sunny singh said:
6 years ago
I think Option A will be correct.
Hina said:
6 years ago
How 37/4 converts into 4?
Anyone explain please?
Anyone explain please?
K.ROSHANRAJ said:
6 years ago
For every 3 mins 5 sec is gained so totally from 7.am to 4.15 pm there is an excess of 15 mins.
So subtract that 15 with the 4.15 pm,
And the answer will be at 4 pm.
So subtract that 15 with the 4.15 pm,
And the answer will be at 4 pm.
Snehashish Das said:
6 years ago
Here seeing so many controversies, I would suggest that if we take the exact accurate value of 925/60.
Then that is equal to 925/60=15.4166666667(if we take 15.41).
Simplification 185/12 that mean 15 and 5/12 part minute.
9 hrs= 9x60=540 min --- 185/12min = 524.58 min.
that means 3 hrs.59 min.35 sec.= 7/12 past 3.
Then that is equal to 925/60=15.4166666667(if we take 15.41).
Simplification 185/12 that mean 15 and 5/12 part minute.
9 hrs= 9x60=540 min --- 185/12min = 524.58 min.
that means 3 hrs.59 min.35 sec.= 7/12 past 3.
Piyush said:
6 years ago
3min 5sec = 3min.
6min 10sec = 6min.
Similary 1hr = 1hr 1min 40sec.
Calculation:
6*10min = 6*10min 10*10sec
60 min = 60 min 100 sec(61min 40 sec)
So, total gain 1hour = 1min 40 sec.
Time between 7 am to 4.15 pm= 9hr 15 min.
In 9hr 15 min time gain will we 15min because;
9*1min 40 sec=> 9min + 360sec =>9 min + 6min =>15min.
So the correct time in the clock is 4 pm.
And gain in remaining 15 min =25sec (5*5).
25 sec can be neglected.
Hence the correct answer option B.
6min 10sec = 6min.
Similary 1hr = 1hr 1min 40sec.
Calculation:
6*10min = 6*10min 10*10sec
60 min = 60 min 100 sec(61min 40 sec)
So, total gain 1hour = 1min 40 sec.
Time between 7 am to 4.15 pm= 9hr 15 min.
In 9hr 15 min time gain will we 15min because;
9*1min 40 sec=> 9min + 360sec =>9 min + 6min =>15min.
So the correct time in the clock is 4 pm.
And gain in remaining 15 min =25sec (5*5).
25 sec can be neglected.
Hence the correct answer option B.
Piyush said:
6 years ago
3min 5sec = 3min.
6min 10sec = 6min.
Similary 1hr = 1hr 1min 40sec.
Calculation:
6*10min = 6*10min 10*10sec
60 min = 60 min 100 sec(61min 40 sec)
So, total gain 1hour = 1min 40 sec.
Time between 7 am to 4.15 pm= 9hr 15 min.
In 9hr 15 min time gain will we 15min because;
9*1min 40 sec=> 9min + 360sec =>9 min + 6min =>15min.
So the correct time in the clock is 4 pm.
And gain in remaining 15 min =25sec (5*5).
25 sec can be neglected.
Hence the correct answer option B.
6min 10sec = 6min.
Similary 1hr = 1hr 1min 40sec.
Calculation:
6*10min = 6*10min 10*10sec
60 min = 60 min 100 sec(61min 40 sec)
So, total gain 1hour = 1min 40 sec.
Time between 7 am to 4.15 pm= 9hr 15 min.
In 9hr 15 min time gain will we 15min because;
9*1min 40 sec=> 9min + 360sec =>9 min + 6min =>15min.
So the correct time in the clock is 4 pm.
And gain in remaining 15 min =25sec (5*5).
25 sec can be neglected.
Hence the correct answer option B.
Shashi said:
6 years ago
We know that 9hr+15min, by converting it in min we get 540+15 = 555min-----eqn1.
To get 3 min parts, we divide 555/3 = 185.
Or we can say we have 185, 3 min.
Multiplying 185 * 5sec (by converting it into min ie 5/60) = 185* (5/60) = 15min.
So distracting 555min - 15min=540.
Or 4hr:15min - 15min = 4hr or 4o'clock.
To get 3 min parts, we divide 555/3 = 185.
Or we can say we have 185, 3 min.
Multiplying 185 * 5sec (by converting it into min ie 5/60) = 185* (5/60) = 15min.
So distracting 555min - 15min=540.
Or 4hr:15min - 15min = 4hr or 4o'clock.
Malini said:
5 years ago
Why we reciprocal it 37÷720? Please explain me.
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