String Burning

Submitted by Loki 8 years, 1 month ago

You have 2 pieces of string of different, unspecified length, and some matches. Each piece of string takes exactly an hour to burn, but the burn rate is not constant.

This means that it could take 59 minutes to burn the first 1⁄4, and 1 minute for the rest.

The strings have different burn rates, and of course you don't know the rates anyway.

Using only the matches and the strings how can you measure 45 minutes.

Attempt Info

  • Correct Attempts: 48
  • Incorrect Attempts: 6
  • Ungraded Attempts: 1
  • Total Attempts: 55

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