Aptitude - Clock - Discussion
Discussion Forum : Clock - General Questions (Q.No. 19)
19.
A watch which gains uniformly is 2 minutes low at noon on Monday and is 4 min. 48 sec fast at 2 p.m. on the following Monday. When was it correct?
Answer: Option
Explanation:
Time from 12 p.m. on Monday to 2 p.m. on the following Monday = 7 days 2 hours = 170 hours.
 The watch gains |
 |
2 + 4 | 4 |  min. |
or | 34 | min. in 170 hrs. |
| 5 | 5 |
| Now, | 34 | min. are gained in 170 hrs. |
| 5 |
| 2 min. are gained in |
|
170 x | 5 | x 2 | hrs |
= 50 hrs. |
| 34 |
Watch is correct 2 days 2 hrs. after 12 p.m. on Monday i.e., it will be correct at 2 p.m. on Wednesday.
Discussion:
56 comments Page 1 of 6.
Pushpa said:
3 weeks ago
I am not understand the answer. Please anyone help me to get this.
Ggvhbh said:
4 months ago
How 4/5 came here? Please explain.
Tanish Kothari said:
2 years ago
See, it is given in the question that the clock is initially 2 minutes slow and after 7 days and 2 hours it is 4 minutes 48 seconds fast. So in this whole journey of 7 days and 2 hours the clock has to first gain that 2 minutes which is lost initially, then only the clock will be able to gain 4 minutes 48 seconds.
So, it is asked in the question that when between the journey the clock will gain that 2minutes.
Hope it helps.
So, it is asked in the question that when between the journey the clock will gain that 2minutes.
Hope it helps.
(22)
Gautam said:
5 years ago
@Nitin
Initially, it is 2 min low at 12 pm so to compensate that loss 2min gain is there but at last, why do they calculate for 2 min gain individually? Explain it.
Initially, it is 2 min low at 12 pm so to compensate that loss 2min gain is there but at last, why do they calculate for 2 min gain individually? Explain it.
(1)
Nitin said:
5 years ago
@All.
Gaining always count from the correct time. 4min gain from correct time but the clock is late by 2min also, therefore, we must include the time (from -2min to correct time) and then add 4 min to them.
Gaining always count from the correct time. 4min gain from correct time but the clock is late by 2min also, therefore, we must include the time (from -2min to correct time) and then add 4 min to them.
Holaram said:
5 years ago
2 min late means that at some point it will show correct time and then after that it gains 4 min 48 sec. So total gain= 2min to correct time to 4 min 48 sec i.e. 2+4min48sec.
(1)
Meethu said:
6 years ago
(2 min + 4 min 48 seconds)=(408 seconds).
For 170 hours.
For 1 hr (408/170)=2.4 seconds,
For 120 seconds(2 min initially),
Hours=(120/2.4)=50.
So Wednesday 2 PM.
For 170 hours.
For 1 hr (408/170)=2.4 seconds,
For 120 seconds(2 min initially),
Hours=(120/2.4)=50.
So Wednesday 2 PM.
(11)
GAURAV said:
6 years ago
Finally, I satisfied with the answers of @Akash vashista and Shashank. Thanks, both of them.
(2)
Siddhant said:
6 years ago
How we are getting after calculation 4min 48 sec in denominator i.e. (5?).
I understood 4*60=240 but I am not getting that how 5 came in the denominator.
Please, anyone help me. Thanks.
I understood 4*60=240 but I am not getting that how 5 came in the denominator.
Please, anyone help me. Thanks.
(1)
Vivek said:
7 years ago
The answer is 2 AM, not 2PM.
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