Puzzle time

Khamelion

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There's a boat in the harbour with a ladder over the side, the rungs of the ladder are 12 inches apart, the bottom rung of the ladder is touching the sea, the tide is coming in at 3 inches every half hour, after 3 hours how many rungs of the ladder will be covered?
 
Just asked wife this and when she got it wrong I told her the answer. Her reply had me in stitches' how can the boat float '

I'm still laughing now but she isnt
 
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