Aptitude - Clock - Discussion

x+((x*5)/(3*60))=555*60.
Find x?

x is the seconds between 7am and correct time.
555 is minutes between 7am and wrong time.

Find x and convert to hrs getting x as 32400 sec.
Then converted to hrs.

32400/3600= 9 hrs.

7am+ 9hrs=4PM.

Actually Sundar's explanation is correct.

Don't get confusion. The question is about two clocks (accurate clock and the error clock). So many of you confused.. 59 7/12 past 3 is wrong because, you are considering only one clock.. you went wrong while dividing 555 minute by 3.. in reality... 555 minutes are passed in ERROR CLOCK,

So you must divide 555 by 3 min 5 seconds (OR 555*60=33300 seconds divided by 3*60+5=185 seconds) Then you will get the right answer.

FAULT CLOCK CORRECT CLOCK

7am < ---------------- > 7am
8am 100 sec < ------------ > 8am
9am 200 sec < ------------ > 9am

So on..

4pm 900 sec < ------------ > 4pm

So 4pm 900 sec = 4pm 900/60 min = 4pm 15 min.

Therefore when Fault clock shows the time 4pm 15 min the Correct clock will show 4pm.

So correct answer is 4pm.

Still I'm confused how the 37/720 hrs is equal to 1/20 hrs.

But it is stated in the question that the wrong clock gains 5 sec in 3 mint. Does it mean that it is 3 mint 5 secs fast?

I'm confused. Someone please explain it for me.

Time from 7 a.m to 4:15 p.m = 9hr 15min. Please explain the above line. how to get the answer "9 hrs 15 min"?

@Asha.

Given that the "clock was set right at 7:00am". So, I think there is no error in time further. Hence at 4:00pm the time is 4:00pm itself.

Please suggest me if I'm wrong.

Dear Asha,

The clock set right at 7.00 am but thereafter it gains 5 seconds every 3 minutes, hence we have to calculate the correct time.

What is mean by "when the watch indicated quarter past 4 o'clock"?

How 55 minute spaces are gained by the minute hand in 60 minutes?