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 9 of 16.
B Rajesh Kannan said:
1 decade ago
Dear Asha,
The clock set right at 7.00 am but thereafter it gains 5 seconds every 3 minutes, hence we have to calculate the correct time.
The clock set right at 7.00 am but thereafter it gains 5 seconds every 3 minutes, hence we have to calculate the correct time.
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.
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.
Bala said:
2 decades ago
Hai Jaslin,
To convert mins and secs into hrs we do:
(3/60)+(5/(60*60)) = 185/3600 = 37/720.
I think u might be clear of this.
To convert mins and secs into hrs we do:
(3/60)+(5/(60*60)) = 185/3600 = 37/720.
I think u might be clear of this.
Sai Sowmya said:
10 years ago
@Anandkumar.
Calculation is simple.
3/60 = 1/20.
5/60*60 = 5/3600 = 1/720.
Now add both the values ==> 1/20+1/720 = 37/720.
Calculation is simple.
3/60 = 1/20.
5/60*60 = 5/3600 = 1/720.
Now add both the values ==> 1/20+1/720 = 37/720.
Sha said:
1 decade ago
Four clocks rang 18 24 40 60 min respectively. If four clocks will rang at 5 o'clock then when will they rang again at same time.
Wadbor said:
9 years ago
@Khalid
You got it right in a simple way. For 9hr it gains 15min so 9hr 15min minus gain of 15min will give 9hr correct time.
You got it right in a simple way. For 9hr it gains 15min so 9hr 15min minus gain of 15min will give 9hr correct time.
Azar said:
1 decade ago
Time from 7 a.m to 4:15 p.m = 9hr 15min. Please explain the above line. how to get the answer "9 hrs 15 min"?
Yogetha said:
5 years ago
@Rajat.
555/60=9.25 that can be written in fractional form by simplifying it as 37/4 since (15*37=555 & 15*4=60).
555/60=9.25 that can be written in fractional form by simplifying it as 37/4 since (15*37=555 & 15*4=60).
Rohit said:
4 years ago
925/60 is not equal to 15, it is equal to 15 5/12 and you subtracted the 15 min but what about 25 sec? Please explain.
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