When you turn over this egg timer, three sand timers measure 3 minutes, 4 minutes and 5 minutes. They cannot be turned over individually.How could you use the timer to measure 6 minutes?
You could measure 7 minutes by adding together 3 and 4 minutes - but does it matter which you do first?
Is it possible to measure 2 minutes? Is it possible to measure half a minute?
What other times could you measure? What if you had three separate sand timers?
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