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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)
- b)4 p.m.
- c)
- d)
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A watch which gains 5 seconds in 3 minutes was set right at 7 a.m. In ...
Time from 7 a.m. to 4.15 p.m. = 9 hours 15 min = 37/4 hours
3 min 5 sec of this clock = 3 min. of the correct clock.
⇒ 37/720 hours of this clock = 1/20 hours of the correct clock
⇒ 37 hours of this clock = (1/20 x 720/37 x 37/4) hours of the correct clock.
= 9 hours of the correct clock.
∴ The correct time is 9 hours after 7 a.m. i.e., 4 p.m
3 min 5 sec of this clock = 3 min. of the correct clock.
⇒ 37/720 hours of this clock = 1/20 hours of the correct clock
⇒ 37 hours of this clock = (1/20 x 720/37 x 37/4) hours of the correct clock.
= 9 hours of the correct clock.
∴ The correct time is 9 hours after 7 a.m. i.e., 4 p.m
Most Upvoted Answer
A watch which gains 5 seconds in 3 minutes was set right at 7 a.m. In ...
Time from 7 a.m. to 4.15 p.m. = 9 hours 15 min = 37/4 hours
3 min 5 sec of this clock = 3 min. of the correct clock.
⇒ 37/720 hours of this clock = 1/20 hours of the correct clock
⇒ 37 hours of this clock = (1/20 x 720/37 x 37/4) hours of the correct clock.
= 9 hours of the correct clock.
∴ The correct time is 9 hours after 7 a.m. i.e., 4 p.m
3 min 5 sec of this clock = 3 min. of the correct clock.
⇒ 37/720 hours of this clock = 1/20 hours of the correct clock
⇒ 37 hours of this clock = (1/20 x 720/37 x 37/4) hours of the correct clock.
= 9 hours of the correct clock.
∴ The correct time is 9 hours after 7 a.m. i.e., 4 p.m
Community Answer
A watch which gains 5 seconds in 3 minutes was set right at 7 a.m. In ...
Since it gains 5 seconds in 3 minutes, in one hour the clock gains 100 seconds.
In 9 hours 15 mins between 7 am and 4:15 pm the clock gains 925 seconds.
So the time to be reduced from 4:15 is 925/60 minutes which comes to 15 (5/12) minutes, which is 3 hours 59 (7/12) minutes.
So the answer is Option A
In 9 hours 15 mins between 7 am and 4:15 pm the clock gains 925 seconds.
So the time to be reduced from 4:15 is 925/60 minutes which comes to 15 (5/12) minutes, which is 3 hours 59 (7/12) minutes.
So the answer is Option A
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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)b)4 p.m.c)d)Correct answer is option 'B'. Can you explain this answer?
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