Measure wire
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How do we measure forty-five minutes using two identical wires, each of which takes an hour to burn? We have matchsticks with us. The wires burn non-uniformly. So, for example, the two halves of wire might burn in 10 minutes and 50 minutes respectively 
Start (0 minute) – using the matchstick, light wire1 on both the sides and wire2 on one side
30 minutes – wire1 will be burnt out completely. Now, light the other end of wire2
End (45 minutes) – wire2 will be burnt out completely…
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