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It is one of the Powerprep questions, and I am figuring the

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Manager
Joined: 28 Apr 2003
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It is one of the Powerprep questions, and I am figuring the [#permalink]

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17 Jan 2004, 04:23
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

It is one of the Powerprep questions, and I am figuring the reason for 11 equal time intervals between strokes. Could someone show a simple solution to the question?

A certain clock marks every hour by striking a number of times equal to the hour, and the time required for a stroke is exactly equal to the time interval between strokes. At 6:00 the time lapse between the beginning of the first strokes and the end of the last stroke is 22 seconds. At 12:00, how many seconds elapse between the beginning of the first stroke and the end of the last stroke?

a.72
b.50
c.48
d.46
e.44

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17 Jan 2004, 12:13
46?

for 6pm....it's stroke + 2sec + stroke + 2sec ....
each stroke takes 2 secs...so by the end of the 5th stroke, 22 secs pass

for 12pm it's the same thing so by the end of the 12th stroke, 46 secs pass

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17 Jan 2004, 12:21
2 seconds per stroke, 2 seconds per pause.

6 o'clock

spspspspsps= 22

12 o'clock
spspspspspspspspspspsps= 46

easier way:

12 o'clock= 2*(six o'clock) plus two seconds (in the middle of the two sixes).

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17 Jan 2004, 12:21
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It is one of the Powerprep questions, and I am figuring the

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