A ladder hangs over the side of a ship anchored in port. The bottom rung of the ladder touches the water. The distance between rungs is 30cm, and the length of the ladder is 270cm. If the tide is rising at a rate of 15cm per hour, how long will it be before the water reaches the top rung?
Common Wrong Answers
“18 hours”
This guess assumes the water level will rise and eventually reach the top rung without considering that the ship rises with the tide.
“9 hours”
This guess calculates the time based on the distance to the top rung without acknowledging that the ladder's position remains unchanged relative to the rising water.
“3 hours”
This guess implies a misunderstanding of the riddle's premise, as it suggests the ship does not rise with the tide, which is incorrect.
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