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Four men are on one side of a rickety bridge on a dark night. The bridge is only strong enough to support two men at a time. It is also necessary for the men crossing the bridge to carry a lantern to guide their way, and the four men have only one lantern between them. Andy can cross the bridge in 1 minute, Ben in 2, Charlie in 5, and Dan in ten minutes. How quickly can all four men be together at the other side?
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