Aptitude - Clock - Discussion

A watch which gains 5 seconds in 3 minutes was set right at 7 a.m?????? what does it actually means??...i had solved it by d way as nitin described..so wts the correct answer,as they hav ignored the 25secs and according to them correct time is 4....wt abt 25 sec....

Can anyone plz tell me how we got below line?

9 hrs 15 min. = 37/4 hrs.

@Archana

It is simple yaar.

9 hrs = (9 x 60) = 540 mins

9 hrs 15 min = (540 + 15) = 555 min.

Now, convert 555 mins to hrs by dividing it by 60 (bcz 60min = 1hr) ok.

Therefore, 555/60 = 37/4 hrs.

That's all. Hope this help you. Have a nice day!

NITIN CREATE CONFUSION

@Sundar:

Nice yaar :-)

Thanks sundar. Done in a simple manner.

Thanks sundar! :) cheers :).

Thanks ya. This is very simple.

How we got 4. 15 pm and 3 min. 5 sec. Of this clock = 3 min. Of the correct clock? Please I'm unable understand.

In 3 MIN = The clock gains 5 sec.
in 60 min(3 * 20) = clock gains 100 sec(5 * 20)
= i.e 100/60 min
= 5/3 min
So , If correct clock shows 1 hour=den da wrong clock shows 1 hr 5/3 min..
i.e
1 hr=1 hr 5/3 min
=1 * 5/(3*60) hour (convert to hour)
=37/36 hour

But we need to do reverse..
i.e
37/36 hrs(in wrong clock) = 1 hr
1 hour in wrong clock = 1/(37/36)=36/37 hr

9hr 15min=37/4 hrs

So
37/4 hours in wrong clock =36/37 * 37/4
= 9
So 7 a.m + 9 hrs= 4 pm ....

I hope every1 got it...