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 6 of 16.
Jimeet said:
1 decade ago
A watch which gains 5 seconds in 3 minutes was set right at 7 a.m?????? what does it actually means??...i had solved it by d way as nitin described..so wts the correct answer,as they hav ignored the 25secs and according to them correct time is 4....wt abt 25 sec....
Javad said:
1 decade ago
Leave all worries guys think practically.
For 3 min 5 sec gain.
Then for 15 min 25 sec, for 1 hour 100 sec i.e. 1.5 min and 10 sec.
For 9 hr 15 min it is 13.5 (i.e. 1.5*9) + 1.5 (i.e. Remaining 10 sec*9).
So totally 13.5+1.5= 15 min gain.
That is 4op o'clock.
For 3 min 5 sec gain.
Then for 15 min 25 sec, for 1 hour 100 sec i.e. 1.5 min and 10 sec.
For 9 hr 15 min it is 13.5 (i.e. 1.5*9) + 1.5 (i.e. Remaining 10 sec*9).
So totally 13.5+1.5= 15 min gain.
That is 4op o'clock.
Sai Charan Reddy said:
1 decade ago
I think the correct option is A. From 7 am to 4:15 pm, number of minutes passed is 555 min. As given for every 3 min it gains an extra 3 seconds.
So 555/3 = 185 min. Therefore 185*(5/60) = 15*5/12, so subtract 4:15 with 15*5/12, we get 59*7/12 min past 3.
So 555/3 = 185 min. Therefore 185*(5/60) = 15*5/12, so subtract 4:15 with 15*5/12, we get 59*7/12 min past 3.
Alya said:
4 years ago
Crt time: 3mins wrong time: 3mins 5 seconds.
So 1 hr = 1hr 100 seconds wrong time.
7:00 Am to 4:15 PM = 9 hrs 15 mins difference,
For 9 hr 15 mins = 9 hr 925 sec wrong time,
Subtract 925 sec (900sec = 15 mins)from 4: 15 PM
So, the ANSWER is 4:00 PM.
So 1 hr = 1hr 100 seconds wrong time.
7:00 Am to 4:15 PM = 9 hrs 15 mins difference,
For 9 hr 15 mins = 9 hr 925 sec wrong time,
Subtract 925 sec (900sec = 15 mins)from 4: 15 PM
So, the ANSWER is 4:00 PM.
(4)
Sundar said:
1 decade ago
@Archana
It is simple yaar.
9 hrs = (9 x 60) = 540 mins
9 hrs 15 min = (540 + 15) = 555 min.
Now, convert 555 mins to hrs by dividing it by 60 (bcz 60min = 1hr) ok.
Therefore, 555/60 = 37/4 hrs.
That's all. Hope this help you. Have a nice day!
It is simple yaar.
9 hrs = (9 x 60) = 540 mins
9 hrs 15 min = (540 + 15) = 555 min.
Now, convert 555 mins to hrs by dividing it by 60 (bcz 60min = 1hr) ok.
Therefore, 555/60 = 37/4 hrs.
That's all. Hope this help you. Have a nice day!
Vivek said:
1 decade ago
x+((x*5)/(3*60))=555*60.
Find x?
x is the seconds between 7am and correct time.
555 is minutes between 7am and wrong time.
Find x and convert to hrs getting x as 32400 sec.
Then converted to hrs.
32400/3600= 9 hrs.
7am+ 9hrs=4PM.
Find x?
x is the seconds between 7am and correct time.
555 is minutes between 7am and wrong time.
Find x and convert to hrs getting x as 32400 sec.
Then converted to hrs.
32400/3600= 9 hrs.
7am+ 9hrs=4PM.
Rinkul Kamboj said:
1 decade ago
We do it in this way.
3min=5sec.
1hr=100sec.
9.15hr=925sec.
You made mistake now in division
925/60=15 min.
But ans will be 925/60=15.416667 or 15 7/12
So the excess time is 15 min.
So, 9.15 hr - 15min7/12sec = 59 7/12min past 3 hr.
3min=5sec.
1hr=100sec.
9.15hr=925sec.
You made mistake now in division
925/60=15 min.
But ans will be 925/60=15.416667 or 15 7/12
So the excess time is 15 min.
So, 9.15 hr - 15min7/12sec = 59 7/12min past 3 hr.
Neci said:
4 years ago
Clock gains 5 seconds every 3 minutes = 100 seconds every hour (60 minutes) = 900 seconds every 9 hours = 15 minutes every 9 hours.
Hence, when the faulty clock shows 4:15 PM, the actual clock should show 15 minutes less i.e. 4:00 PM.
Hence, when the faulty clock shows 4:15 PM, the actual clock should show 15 minutes less i.e. 4:00 PM.
(3)
Rutvik Dalal said:
4 years ago
Clock gains 5 seconds every 3 minutes = 100 seconds every hour (60 minutes) = 900 seconds every 9 hours = 15 minutes every 9 hours.
Hence when the faulty clock shows 4:15 PM, the actual clock should show 15 minutes less i.e. 4:00 PM.
Hence when the faulty clock shows 4:15 PM, the actual clock should show 15 minutes less i.e. 4:00 PM.
(29)
P.V.N said:
1 decade ago
For 9 hrs its 9x60=540 minutes.
In 540 minutes (540/3)=180 i.e 180 times 3 minutes are there for each 3 minute it is 5 second then 180x5=900 seconds 900/60=15 minutes, which is extra to be subtracted from 4.15 pm. So 4 is the answer.
In 540 minutes (540/3)=180 i.e 180 times 3 minutes are there for each 3 minute it is 5 second then 180x5=900 seconds 900/60=15 minutes, which is extra to be subtracted from 4.15 pm. So 4 is the answer.
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