Tuesday, January 31, 2006

 

Fuses

Good morning,
Time to exercise the brain.

Using fuses as a timer.

There are two lengths of crude fuses.
They are not of the same length.
They are also not of uniform width.
Thus they do not burn regularly along their length,
some parts may burn faster than other parts.

But each fuse will burn in 4 minutes.
And burning half of either fuse
will not take 2 minutes,
it will take more or less.

Using these two fuses as a timer,
how can one time 3 minutes?
This is a neat and simple but challenging puzzle.


This puzzle is not that difficult.
But if one does not wish to tax the brain too much,
visit downunder.

Have a nice day.
Ronald






























Answer to Fuse puzzle.

Lighting both ends of one fuse will burn it in 2 minutes .
Thus, light one fuse from both ends and the other fuse
from only one end, at the same time.
Once the fuse which is burning from both ends burns out,
in 2 minutes, light the second end of the other fuse.
This remaining fuse will burn in 1 minute, from both sides.
The total time will thus be 3 minutes.
QED.

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