Ship's Ladder Quiz Puzzle

On a recent holiday to the seaside the Quiz Master Shop team was enjoying a restorative pint overlooking the harbour. We noticed that the biggest boat had a ladder that was hanging over the side and into the water, with four rungs submerged. In fact the top of the fourth rung was exactly on the surface of the water.

Each of the rungs was a cylinder with a diameter of two inches, and the gap between the rungs was eleven inches. The tide was rising at a rate of 18 inches per hour.

So how many rungs were submerged two hours later when we left the harbourside pub?

As usual you can post your suggested answers as a comment on this website, reply to the post on Facebook, or retweet or reply on Twitter @quizmastershop.

Answer at 9.00 on Monday


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