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 5 of 16.
Soujanya said:
1 decade ago
Can anyone tell the reason behind the multiplication [1/20*720/37*37/4]?
Vivek said:
1 decade ago
Time from 7 a.m to 4:15 p.m = 9hr 15min.
= 9*60min+15min = 555min.
3min 5sec clock(wrong) = 3min (correct).
3*60sec+5sec = 3*60 sec.
185sec = 180sec.
If 1 sec = 180/185 sec.
Then 555 min = (180/185)*555.
= 540 min.
= 9hr.
Than correct answer is 7a.m +9hr = 4p.m.
= 9*60min+15min = 555min.
3min 5sec clock(wrong) = 3min (correct).
3*60sec+5sec = 3*60 sec.
185sec = 180sec.
If 1 sec = 180/185 sec.
Then 555 min = (180/185)*555.
= 540 min.
= 9hr.
Than correct answer is 7a.m +9hr = 4p.m.
Kakoli said:
1 decade ago
But it is stated in the question that the wrong clock gains 5 sec in 3 mint. Does it mean that it is 3 mint 5 secs fast?
I'm confused. Someone please explain it for me.
I'm confused. Someone please explain it for me.
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"?
Asharani.k said:
1 decade ago
@Asha.
Given that the "clock was set right at 7:00am". So, I think there is no error in time further. Hence at 4:00pm the time is 4:00pm itself.
Please suggest me if I'm wrong.
Given that the "clock was set right at 7:00am". So, I think there is no error in time further. Hence at 4:00pm the time is 4:00pm itself.
Please suggest me if I'm wrong.
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.
Banu said:
1 decade ago
What is mean by "when the watch indicated quarter past 4 o'clock"?
Praveensiva said:
1 decade ago
How 55 minute spaces are gained by the minute hand in 60 minutes?
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.
XXXX said:
1 decade ago
Total hours between 7 a.m to 4.15 p.m is 9 hrs 15 min.
3 min gains 5 seconds.
15 min gains 25 seconds.
60 min gains 100 seconds.
i.e. 1 hour gains 100 seconds.
i.e. 9 hours gains 900 seconds.
i.e. 9 hours 15 min gains 900+25 = 925 seconds.
Now, 9 hours 15 min = 33300 seconds.
The correct time is = 33300 - 925 = 32375 seconds.
= 32375/3600 .
= 8.99 hr = 9 hr.
Therefore the correct time is 4 p.m.
3 min gains 5 seconds.
15 min gains 25 seconds.
60 min gains 100 seconds.
i.e. 1 hour gains 100 seconds.
i.e. 9 hours gains 900 seconds.
i.e. 9 hours 15 min gains 900+25 = 925 seconds.
Now, 9 hours 15 min = 33300 seconds.
The correct time is = 33300 - 925 = 32375 seconds.
= 32375/3600 .
= 8.99 hr = 9 hr.
Therefore the correct time is 4 p.m.
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