Rising tide

 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 1/2 inches thick and there is a gap of eight inches between the rungs.

After 5 1/2 hours , how many rungs of the ladder would have submerged?



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