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 15 of 16.
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!
Archana said:
1 decade ago
Can anyone plz tell me how we got below line?
9 hrs 15 min. = 37/4 hrs.
9 hrs 15 min. = 37/4 hrs.
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....
Smartsuru 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?
Ans: Whenever a original clock runs for 3 min (180 sec) the given clock will run 3 min 5 sec (185 sec).
Ans: Whenever a original clock runs for 3 min (180 sec) the given clock will run 3 min 5 sec (185 sec).
Nitin said:
1 decade ago
From 7am to 4:15pm the time traveled will be 9 hours and 15 min.
So in minutes it will be (9*60)+15=540+15=555
After every 3 min the clock will add 5 second,so in 555 min no of
seconds that will be added=(555/3)*5=925 seconds=925/60min=15min and 25sec
so the correct time will be=CURRENT TIME(that is 4:15pm)-(15min and 25 sec)
=3:59:35pm
35 seconds in min-->35/60=7/12min
so the correct answer must be 59(7/12) which is ""A""
[But this is wrong, read Sundar's explanation given below]
So in minutes it will be (9*60)+15=540+15=555
After every 3 min the clock will add 5 second,so in 555 min no of
seconds that will be added=(555/3)*5=925 seconds=925/60min=15min and 25sec
so the correct time will be=CURRENT TIME(that is 4:15pm)-(15min and 25 sec)
=3:59:35pm
35 seconds in min-->35/60=7/12min
so the correct answer must be 59(7/12) which is ""A""
[But this is wrong, read Sundar's explanation given below]
Shyam said:
1 decade ago
why 720/37?
Vinu said:
1 decade ago
Any body understand last step? can you explain?
Nitesh Nandwana said:
1 decade ago
@Saranya
(3/60)+(5/(60*60)) = 185/3600 = 37/720.
185, it is simple calculation babes.
(3/60)+(5/(60*60)) = 185/3600 = 37/720.
185, it is simple calculation babes.
Ajay said:
1 decade ago
@Swetha
3 min converted into hours by dividing with 60.
3/60 hrs = 1/20 hrs.
3 min converted into hours by dividing with 60.
3/60 hrs = 1/20 hrs.
Swetha said:
1 decade ago
Can anybody tell me how did we get '1/20 hrs of the correct clock' ?
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