A ship is sailing in high seas. The tide is rising at the rate of 16 inches per hour.
A ladder is rolled down from the deck.
Four rungs of the ladder are submerged in the water.
Each rung is 1 ½ inches thick and there is a gap of eight inches between the rungs.
After 5 ½ hours, how many rungs of the ladder would have submerged?
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