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:
155 comments Page 16 of 16.
Rajat said:
6 years ago
9hrs and 15 minutes =555 and 555/60 = 9.25, but how it is 37/4?
Please explain.
Please explain.
Yogetha said:
6 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:
6 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.
MOHITH said:
2 weeks ago
THE CORRECT ANSWER IS OPTION(A)
Step 1: Find total gain per minute
Given: 5 sec gain in 3 min
Gain per minute = 5/3 sec
Step 2: Find total time shown by watch
From 7:00 a.m. to 4:15 p.m. = 555 minutes
Step 3: Find total gain in that time,
Total gain = 555 × 5/3.
= 925 sec.
Convert:
925 sec = 15 min 25 sec.
Step 4: Subtract gain from shown time,
Watch is fast, so:
Real time=4:15−15 min 25 sec.
= 3:59:35 p.m.
converting to mixed fraction give us answer as 3:59:35/60 that is equals to 3:59:7/12.
Step 1: Find total gain per minute
Given: 5 sec gain in 3 min
Gain per minute = 5/3 sec
Step 2: Find total time shown by watch
From 7:00 a.m. to 4:15 p.m. = 555 minutes
Step 3: Find total gain in that time,
Total gain = 555 × 5/3.
= 925 sec.
Convert:
925 sec = 15 min 25 sec.
Step 4: Subtract gain from shown time,
Watch is fast, so:
Real time=4:15−15 min 25 sec.
= 3:59:35 p.m.
converting to mixed fraction give us answer as 3:59:35/60 that is equals to 3:59:7/12.
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