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:
154 comments Page 1 of 16.
Satvik said:
1 year ago
3 min - 5 sec.
30 min - 50 sec.
60 min - 100 sec. [ 1 hour - 100 sec]
9 hours - 900 sec [900 sec = 15 min ].
The clock is showing 4:15 and we know that it gained 15 mins
Therefore it must the real-time is 4 pm.
30 min - 50 sec.
60 min - 100 sec. [ 1 hour - 100 sec]
9 hours - 900 sec [900 sec = 15 min ].
The clock is showing 4:15 and we know that it gained 15 mins
Therefore it must the real-time is 4 pm.
(101)
Rama said:
3 years ago
Gained time = 925 secs ==> 15 mins and 25 secs.
From 4.15 - 15 mins ==> 4 (only subtracting the 15mins).
From 4 - 25 secs ==> converting in fraction (25/60) ==> need to subract 25 sec ie: remaining of 35/60,
So,3 hrs and 59 mins and 35/60 ==> 59 mins 7/12 past 3. So, the answer is A.
From 4.15 - 15 mins ==> 4 (only subtracting the 15mins).
From 4 - 25 secs ==> converting in fraction (25/60) ==> need to subract 25 sec ie: remaining of 35/60,
So,3 hrs and 59 mins and 35/60 ==> 59 mins 7/12 past 3. So, the answer is A.
(91)
Sonia said:
3 years ago
9 hr 15 min= 555min.
Watch gain 5 sec in 3 min so, we will check how many minutes gain 5 sec.
So, 555/3= 185min
185 min gains how many sec=185 multiplies with 5 = 925 sec.
And convert 925sec into min= 15.41 min( gain a minute, so we have to minus it from the time shown)
Now 4.15 was showing on the clock now minus 15min from it= 4pm.
Watch gain 5 sec in 3 min so, we will check how many minutes gain 5 sec.
So, 555/3= 185min
185 min gains how many sec=185 multiplies with 5 = 925 sec.
And convert 925sec into min= 15.41 min( gain a minute, so we have to minus it from the time shown)
Now 4.15 was showing on the clock now minus 15min from it= 4pm.
(79)
Khairul Basar said:
11 months ago
Gain:
3 minutes 5 sec,
15 minutes 25 sec,
30 minutes 50 sec,
60 min( 1 hour) 100 sec.
Then, 7 to 4:15 - 9 hours 15 minutes.
Per hour 100 sec= 900.
And 15 minutes 25 sec.
Total - 925 sec.
925 sec รท 60 = 15 minutes.
(15 mins is extra).
9 hours 15 - 15 minutes 9 hours.
7 AM to 4 PM (9 hours).
So, the answer is 4 PM.
3 minutes 5 sec,
15 minutes 25 sec,
30 minutes 50 sec,
60 min( 1 hour) 100 sec.
Then, 7 to 4:15 - 9 hours 15 minutes.
Per hour 100 sec= 900.
And 15 minutes 25 sec.
Total - 925 sec.
925 sec รท 60 = 15 minutes.
(15 mins is extra).
9 hours 15 - 15 minutes 9 hours.
7 AM to 4 PM (9 hours).
So, the answer is 4 PM.
(68)
Kiran said:
3 years ago
5sec gains in 3min.
5sec =3 min.
Multiply with 20.
100 sec gains in 60min(100sec = 60min).
Then 300sec = 180min.
Converting 300 sec into min is 5min.
180min is 3 hrs.
So it gains 5min in 3hrs.
We know that from 7 to 4 .15min is 9hrs 15min.
It gains 5min in 3hrs then for 9hrs it gains 15min so subtract 15 min from the time.
Then the answer is 4'pm.
5sec =3 min.
Multiply with 20.
100 sec gains in 60min(100sec = 60min).
Then 300sec = 180min.
Converting 300 sec into min is 5min.
180min is 3 hrs.
So it gains 5min in 3hrs.
We know that from 7 to 4 .15min is 9hrs 15min.
It gains 5min in 3hrs then for 9hrs it gains 15min so subtract 15 min from the time.
Then the answer is 4'pm.
(55)
Rutvik Dalal said:
4 years ago
Clock gains 5 seconds every 3 minutes = 100 seconds every hour (60 minutes) = 900 seconds every 9 hours = 15 minutes every 9 hours.
Hence when the faulty clock shows 4:15 PM, the actual clock should show 15 minutes less i.e. 4:00 PM.
Hence when the faulty clock shows 4:15 PM, the actual clock should show 15 minutes less i.e. 4:00 PM.
(29)
Dhanush said:
11 months ago
For 3 mins it gains 5 seconds.
Then for 925 minutes (9hr 15 min) it gains 15 mins 25 seconds.
So, subtract 15 mins 25 seconds from 4:15.
We will get 3:59:35 which is 59* (7/12) mins past 3.
Then for 925 minutes (9hr 15 min) it gains 15 mins 25 seconds.
So, subtract 15 mins 25 seconds from 4:15.
We will get 3:59:35 which is 59* (7/12) mins past 3.
(28)
Aanch said:
2 years ago
The right answer is option A.
(15)
Pumpkin pieeeeee said:
5 months ago
The answer is A.
A lot of people are ignoring the extra 25 seconds.
The exact time gained is 925 seconds.
(This is best explained in the comment down below)
900 seconds is 15 minutes. So, we deduct 15 minutes from the time given.
ADDITIONALLY, 25 seconds also will be deducted -
60 - 25 = 35 seconds remaining.
Hence, 35/60 which explains the extra 7/12.
The final answer is -> 59 7/12 minutes past 3.
A lot of people are ignoring the extra 25 seconds.
The exact time gained is 925 seconds.
(This is best explained in the comment down below)
900 seconds is 15 minutes. So, we deduct 15 minutes from the time given.
ADDITIONALLY, 25 seconds also will be deducted -
60 - 25 = 35 seconds remaining.
Hence, 35/60 which explains the extra 7/12.
The final answer is -> 59 7/12 minutes past 3.
(15)
Rohit said:
4 years ago
925/60 is not equal to 15, it is equal to 15 5/12 and you subtracted the 15 min but what about 25 sec? Please explain.
(13)
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