Answer to Puzzle #40: 4 & 7 minute hourglasses to measure 9 minutes 40. Using only a 4 minute and 7 minute hourglass or egg timer how would you measure exactly 9 minutes? This puzzle comes to me via the same source as the previous four. It also apparently appears in a book called 'Are You Smart Enough to Work at Google?' Before reading the answer can I interest you in a clue? The puzzle appears quite difficult. It's not dissimilar to the 'Die Hard Water Puzzle' but it is somewhat more complicated. Before we can take a run at it we're going to have to build some tools,
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