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 14 of 16.
Brijesh said:
5 years ago
Use this formula.
(60*hour -11*minutes)/2 by this will get angle btw hour and minute hand.
Then we know the hour hand is leading so add minute hand will get an answer.
(60*hour -11*minutes)/2 by this will get angle btw hour and minute hand.
Then we know the hour hand is leading so add minute hand will get an answer.
Rajat said:
5 years ago
9hrs and 15 minutes =555 and 555/60 = 9.25, but how it is 37/4?
Please explain.
Please explain.
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).
RESHMA said:
5 years ago
@Mamta.
Your explanation is quite easy for me to understand. Thanks for helping.
Your explanation is quite easy for me to understand. Thanks for helping.
Prashasti said:
5 years ago
Well said, Thank you @Sundar.
Rishabh said:
4 years ago
Thanks for explaining @Sundar.
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)
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)
Karthik said:
4 years ago
Watch gain 5 sec each 3min.
1-hour watch gain 100sec.
100x9 =900 further 15 min watch gain 25sec if we divided 925/60 we get 15 min we minus 15 min from 4.15 we get 4.00.
1-hour watch gain 100sec.
100x9 =900 further 15 min watch gain 25sec if we divided 925/60 we get 15 min we minus 15 min from 4.15 we get 4.00.
(7)
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.
(13)
Post your comments here:
Quick links
Quantitative Aptitude
Verbal (English)
Reasoning
Programming
Interview
Placement Papers