High Tide
A boat has a ladder with six rungs on it. The rungs are spaced one foot from each other, the lowest one starting a foot above water. The tide rises by 10 inches every 15 minutes.
How many rungs will be still above water 2 hours later?
SOLUTION
Six rungs – the ship and the ladder will be rising with the tide.
We do not know where this puzzle originated from. If you have any information, please let us know via email.