Personal Comment: I love this simple logical problem!
The Time & Tide Enigma!
What we know: A ship is at anchor. Over the side hangs a rope ladder with rungs a foot apart. The tide rises at a rate of 8 inches per hour.
Enigma: At the end of six hours, how much of the rope ladder will remain above water, assuming that 8 feet were above the water when the tide began to rise?
Solution: Since the ship is afloat, the water level in relation to the ship stays the same. Therefore, 8 feet are above water, just as the beginning!
See who got this right
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