There are two plastic wires, where each of them takes exactly sixty minutes to burn completely if they are lit from only one end. Both of those wires burns with a consistent speed.
How to measure 45 minutes with those two wires?
1) burn 1st wire from both end and 2nd wire from one end.
2) when 1st wire gets completely burned out (by then exactly 30 minutes is over),
burn the second wire from 2nd end as well.
3) when 2nd run completely gets burned , you know its 45 minutes.
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