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Neurobics

February Answer

Here is one of the two solutions.

First Bono and Edge travel across the bridge together. Then Edge remains and Bono walks back to the other side with the torch (time elapsed so far = 3 minutes). Then Adam and Larry travel across the bridge together and Edge returns alone with the torch (time elapsed so far = 15 minutes). Finally Bono and Edge cross the bridge. The total time elapsed is 17 minutes.

Russell Dear is a Mathematician living in Invercargill