Aptitude - Clock - Discussion

A watch which gains 5 seconds in 3 minutes was set right at 7 a.m? what does it actually means?

Ans: Whenever a original clock runs for 3 min (180 sec) the given clock will run 3 min 5 sec (185 sec).

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

To: Nitin

You are wrong. The given answer is correct. Don't get confused.

Let me explain in simple manner:

Error Clock :: Original Clock

3 min 5 sec :: 3 min

185 sec :: 180 sec

[9 hr 15 min = 555 min = 33300 sec]

33300 sec :: (180/185 x 33300) sec

33300 sec :: 32400 sec

333000sec = 9 hrs 15 min :: 32400 sec = 9 hrs [:. 32400/3600 = 9]

So,
Time passed by Error clock = 9 hrs 15 min.
Time passed by Original clock = 9 hrs.

Therefore, 9 hrs after 7 am is 4 pm.


Note: What was wrong in Nitin's explanation?

555/3 <--- Problem is here.

It should be

555 min/3 min 5 sec [or] 33300/185

Please think twice before solve problem. Hope this will help you. All the best!

@Sundar:

Nice yaar :-)

Thanks sundar. Done in a simple manner.

Thanks sundar! :) cheers :).

Thanks ya. This is very simple.