Rising Tide

Ramarao Rama Rao
The ship was sailing. The tide was rising at the rate of 16 inches per hour. Four rungs were already Below the water. Each rung was 1/1/2 inches thick and there was a gap of eight inches between rungs. After five and one half hours later how many rungs of the ladder would have been submerged? Answer: 4 rungs only. Boat rises with the tide. 

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