# 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:
 59 7 min. past 3 12
4 p.m.
 58 7 min. past 3 11
 2 3 min. past 4 11
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:
148 comments Page 1 of 15.

Satvik said:   2 months 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.
(17)

Aanch said:   5 months ago
The right answer is option A.
(8)

Rama said:   2 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.
(68)

Sonia said:   2 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.
(71)

Kiran said:   2 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.

(49)

Puppireddy Sai Krishna said:   2 years ago
If the clock gains 5sec for every 3mins it travels 9hrs and 15mins i.e., 9.25hrs.
Let the actual clock goes 'x' 3mins.

Then the clock which gains 5 secs for every 3 mins will go (3mins)x + (5secs)x =9.25hrs
=> (3+ (5/60))x = 9.25*60.
So x= 180mins,
i.e., x=3hrs,
So the actual clock goes 3x i.e., 9hrs.
So, 9hrs from 7 a.m. is 4 p.m.
(6)

Mervin said:   2 years ago
3 min = 3+ 5/60 min = 3+1/12 = 37/12 min.

quarter past = 15 min.

7am-4:15pm = 9hr 15 min= 9 x 60+15=555min.
for 37/12 min = 3 min,
for 555min = ?
540min.

540/60 = 9hr,
7am + 9h = 4pm.
(11)

Rutvik Dalal said:   3 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.
(24)

Rohit said:   3 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.
(11)

Karthik said:   3 years ago
Watch gain 5 sec each 3min.

1-hour watch gain 100sec.

100x9 =900 further 15 min watch gain 25sec if we divided 925/60 we get 15 min we minus 15 min from 4.15 we get 4.00.
(5)