Two pirates are watching the ships come in to port one day when they notice something. A worn rope ladder hangs over the side of a pirate ship anchored in the main Krawk Island port. The bottom rung is low enough to touch the water. The distance between the rungs is 25 cm and the length of the rope ladder is 225 cm. After a few hours, the pirates realize that the tide is rising at the rate of 20 cm each hour. This makes them curious!
Counting from the top, how long will it take the water to reach the fifth rung?
