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 6 of 6.
Madhu said:
1 decade ago
The time total gain is (2+4min 48sec)i.e 20*60+4*60+48=408 Sec.
means 408 sec covered in 170 hrs (from this monday to fallowing monday means 7*24=168hrs+from 12.00pm to 2.00pm means 2hrs, i.e 168+2=170hrs),
in 1hrs 85/204 sec covered (170/408)
so to cover 120 sec (2mns)how many hours taken
=(85/204)*120
=50 hrs.
To cover 2mns it takes 50hrs. so it will show correct time on 2 days 2 hrs after (2*24+2=50)i.e wednes day 2.00 PM.
means 408 sec covered in 170 hrs (from this monday to fallowing monday means 7*24=168hrs+from 12.00pm to 2.00pm means 2hrs, i.e 168+2=170hrs),
in 1hrs 85/204 sec covered (170/408)
so to cover 120 sec (2mns)how many hours taken
=(85/204)*120
=50 hrs.
To cover 2mns it takes 50hrs. so it will show correct time on 2 days 2 hrs after (2*24+2=50)i.e wednes day 2.00 PM.
Akshay said:
1 decade ago
a clock is set right at 8.a.m.the clock gaing 10 min in 24 hours.
Jimeet said:
1 decade ago
pls explain again the whole ans i didnt get it.....
Nitesh Nandwana said:
1 decade ago
@Vinesh
The question isn't that 2 min should be added or subtracted, the question is that why are we doing so ? got it ??
"gains uniformly is 2 minutes low". It means clock is 2 min late at noon on Monday Okay ?
Now on next Monday it is 4 min 48 sec fast means it total gain is
= ( 2 min + 4min 48sec)
The question isn't that 2 min should be added or subtracted, the question is that why are we doing so ? got it ??
"gains uniformly is 2 minutes low". It means clock is 2 min late at noon on Monday Okay ?
Now on next Monday it is 4 min 48 sec fast means it total gain is
= ( 2 min + 4min 48sec)
Vinesh said:
2 decades ago
2min low at monday means we should subtract, not add....
Kanika said:
2 decades ago
pls explain again the whole ans i didnt get it
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