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Brain teaser # 13

Prateek Agarwal (Sr. Executive - Finance & Accounts) (1732 Points)

25 June 2012

Try this one:-

There is a clock that has a special way of telling the time. It does not have any hands or numbers on it, but it has a chimer.

If the time is 1 o'clock, it chimes once. If the time is 2 o'clock, it chimes twice, and so forth. The time gap between any two chimes is 2 seconds.

How many seconds would it take you to know the time, after the first chime is heard, if it is 4 o'clock?

puzzle : chimer clock

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31 Replies

KRISHNAPRASAD IYER (B.Com , CA Final) (657 Points)
Replied 25 June 2012

6 seconds??

Monith Agarwal (MR.) (117 Points)
Replied 25 June 2012

6 seconds

(Guest)

8 SECONDS

FIRST CHIME.... 2 SECONDS... SECOND CHIME....2 SECONDS.....THIRD CHIME.....2 SECONDS....FOURTH CHIME....

2 SECONDS... NO FURTHER CHIME...

THEREFORE 2 + 2 + 2 + 2 = 8 SECONDS....

Monith Agarwal (MR.) (117 Points)
Replied 25 June 2012

DEAR JIJU

the question is how much time would it take after first chime - so its second+third+fourth ,ie, 2+2+2= 6 sec

RaGHuRaM (The Easy are never Good and the Good are never Easy....) (4952 Points)
Replied 25 June 2012

Answer is 8 seconds........

If the time is 4 o'clock, the clock will chime three times after the first one......

So the time taken is 3 x 2 = 6 seconds....

But extra time of 2 seconds is required to see whether it chimes again after the fourth chime.......

So total time required = 6 +2 = 8 seconds.....

(Guest)

Originally posted by : Monith Agarwal
	DEAR JIJU the question is how much time would it take after first chime - so its second+third+fourth ,ie, 2+2+2= 6 sec

Dear Monith...

after 6 seconds.. we hear fourth chime and after that we will wait for the fifth chime.. if there is no fifth chime after that it means it four o' clock.. Unless we wait how would one come to know that it is four o'clock or not...

Monith Agarwal (MR.) (117 Points)
Replied 25 June 2012

i agree with raghuram's explanation.

@ jijo i couldnt understand your earlier explanation until i read raghuram's!

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Prateek Agarwal (Sr. Executive - Finance & Accounts) (1732 Points)
Replied 25 June 2012

Yes...you guys got it right....

But there is a prominent mistake in the question itself...

The time is more than 8 seconds because you have also got to consider the time of the chime as well. If the chime itself takes 2 seconds to mark one hour, then the time for 4 o'clock increases. Isn't it??