There is a ship floating at anchor at low tide with a ladder over the side. The ladder has 10 rungs, each 1m apart. If at low tide 5 rungs are below the surface of the water, and the water rises at 1.5m per hour, then how many rungs of the ladder will be visible 2 1/2 hours later?
This cannot be undone and I am sure it will be greatly appreciated.
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