Main content

Today Puzzle #548

Puzzle No. 548– Monday 19 August

I have two haggis in the fridge. One weighs twice as much as the other. In cooking them, I know that the time taken to reach the same centre temperature goes as the square of the diameter. Both haggis are plunged into boiling water and left boiling. The smaller one is ready after one hour at which point I start playing my bagpipes. I stop playing when the second one is done. How long does my long long-suffering family have to endure the bagpipes?

Today’s #PuzzleForToday has been set by Hugh Hunt, Reader in Engineering Dynamics and Vibration at Trinity College, Cambridge

Click here for the answer

35 minutes

The smaller one has diameter d so the bigger one has diameter 2^(1/3)d. Time for the first is 1 hour so time for the second is therefore 2^(2/3) hours = 1.59 hours, ie 35 minutes longer

More fiendish brain-teasers and quizzes on BBC Radio...