More Free Riddles
Here are some more free riddles. To start with, there is the
following lateral thinking puzzle I recently dreamt up. Have
fun!
The Jail Cell Clock
You are locked in a jail cell with no windows. and you need
to tap out a message on the wall for the man in the other cell
next to you. The problem is that you have to do it at exactly
9:15 PM, when the guard outside is switched, so your noise won't
be noticed. You can't hear the switching of the guards through
your walls, and you have no clock.
There is a faucet with water dripping very consistently from
it in the corner, but you don't know if it is dripping at 30
or 40 or however many drops per minute, and that wouldn't give
you the time in any case. You can just make out the chiming of
a church bell, but it chimes just once at the top of each hour,
so you can't tell the time from that. You can feel the wall facing
west start to cool after the sun sets, but you don't know what
time the sun is setting, and this isn't very precise in any case.
Your dinner is always passed into your cell between 6:15 and
6:45. How do you determine when it is exactly 9:15 PM?
How Many Seconds?
If a clock takes six seconds to strike six times at six o'clock,
how many seconds will it take to strike eleven times at eleven
o'clock?
Another Clock Riddle
On May 5, 2006, three clocks were set at noon. The following
day at noon, one was found to be a minute slow, another a minute
fast, and the third still had the exact time. If they continue
at the same speeds, on what date will they once again all read
12:00?
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Answers to the Riddles
The Jail Cell Clock
After dinner arrives, you listen for the church bell. Since
dinner comes between 6:15 and 6:45, the next chiming has to be
at 7:00 PM. When you hear it, you start to count the drips from
the faucet until you hear the chime again at 8:00 PM. Divide
the number of drips by four, and you'll have the number of drips
that fall in fifteen minutes (Or you can divide by sixty to get
the drops per minute, and then multiply this by fifteen). When
the bell chimes again at 9:00, you start counting drips until
you reach the specified number. It is now 9:15 PM, and time to
tap out your message.
How Many Seconds?
12 seconds. The timing would naturally start on the first
strike. At six, there would be five more strikes in the next
six seconds, for a time of 1.2 seconds per strike. After the
first strike at eleven, the following ten strikes would then
take 12 seconds.
Another Clock Riddle
One must lose twelve hours and the other gain twelve to read
the same as the correct one. Twelve hours is 720 minutes, so
it will take 720 days from the first day to all be synchronized
at 12:00 again. This would be on April 24, 2008 (2008 is a leap
year).
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