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:
Question:
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:
[A].
4 p.m.
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:
[A].
| 59 | 7 | min. past 3 |
| 12 |
[B].
[C].
| 58 | 7 | min. past 3 |
| 11 |
[D].
| 2 | 3 | min. past 4 |
| 11 |
Answer: Option B
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.