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wiganworld   (Feedback, help, your ideas for new content.)

Started by: jo anne (34721) 

You have a couple of glass sand timers. One takes seven minutes for the sand to trickle through and the other takes eleven minutes for the sand to trickle through. Using these two, can you time a 15-minute passage of time, exactly?

(Taken from Johnny Ball's book - Ball of Confusion)

Replied: 11th Jan 2012 at 11:51

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