Multiple choice general knowledge math & puzzles

A boat has a ladder that has six rungs. Each rung is one foot apart. The bottom rung is one foot from the water. The tide rises at 12 inches every 15 minutes. High tide peaks in one hour. When the tide is at its highest, how many rungs are under water?

  1. 5

  2. 4

  3. 3

  4. none

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

As the tide rises, the boat floats higher on the water. Because the ladder is attached to the boat, it rises with the tide, meaning the water level relative to the rungs never changes.