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:
156 comments Page 8 of 16.
Dhanush said:
2 years ago
For 3 mins it gains 5 seconds.
Then for 925 minutes (9hr 15 min) it gains 15 mins 25 seconds.
So, subtract 15 mins 25 seconds from 4:15.
We will get 3:59:35 which is 59* (7/12) mins past 3.
Then for 925 minutes (9hr 15 min) it gains 15 mins 25 seconds.
So, subtract 15 mins 25 seconds from 4:15.
We will get 3:59:35 which is 59* (7/12) mins past 3.
(35)
Mervin said:
4 years ago
3 min = 3+ 5/60 min = 3+1/12 = 37/12 min.
quarter past = 15 min.
7am-4:15pm = 9hr 15 min= 9 x 60+15=555min.
for 37/12 min = 3 min,
for 555min = ?
540min.
540/60 = 9hr,
7am + 9h = 4pm.
quarter past = 15 min.
7am-4:15pm = 9hr 15 min= 9 x 60+15=555min.
for 37/12 min = 3 min,
for 555min = ?
540min.
540/60 = 9hr,
7am + 9h = 4pm.
(12)
Tejas said:
10 years ago
Total hours with error from 7 am to 4:15 pm = 9 h 15 min = 33300 secs.
Total original hours from 7 am to 4 pm = 9 hrs = 32400 secs.
Therefore, 33300 - 32400 = 900.
900/60 = 15 min.
Total original hours from 7 am to 4 pm = 9 hrs = 32400 secs.
Therefore, 33300 - 32400 = 900.
900/60 = 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.
Praveen said:
9 years ago
@Sundar.
How it should be 555 min/3 min 5 sec [or] 33300/185"?
It must be divided by 3min right, not 3 min 5 sec.
How you are saying it must be divided by 3min 5 sec?
How it should be 555 min/3 min 5 sec [or] 33300/185"?
It must be divided by 3min right, not 3 min 5 sec.
How you are saying it must be divided by 3min 5 sec?
Karthik said:
5 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)
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.
Brijesh said:
6 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.
Vasundhara said:
9 years ago
At a railway station, a 24-hour watch loses 3 min in 4 hours. If it is set correctly on Sunday noon when will the watch show correct time?
Please give me the solution.
Please give me the solution.
K.ROSHANRAJ said:
7 years ago
For every 3 mins 5 sec is gained so totally from 7.am to 4.15 pm there is an excess of 15 mins.
So subtract that 15 with the 4.15 pm,
And the answer will be at 4 pm.
So subtract that 15 with the 4.15 pm,
And the answer will be at 4 pm.
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