XXX mensday.wsr - a simple countdown timer Pictures
This puzzle comes to me via the same source as the previous four. Using only a 4 minute and 7 minute hourglass or egg Eg how would you measure exactly 9 minutes? Before reading the answer can I interest you in a clue? The puzzle appears quite difficult. Before we can take a run at it we're going to have to build some tools, we will then use them in combination. Addition The simplest of Egg Timer 5 Minutes tools.
We Egg Timer 5 Minutes combine hourglasses in series. We could use the 4 and the 7 one after the other to measure 11 minutes.
Or any other simple combination. Difference If we were to start both hourglasses together, flip the 4 when it reaches the end the difference between it ending for the second time and the 7 minute ending is 1 minute. The difference between 4 runs of the 4 and 3 runs of the 7 would be 16 as against 21 respectively. So 5 minutes. Early flipping We could Egg Timer 5 Minutes example start both timers together. When the 4 minute hourglass runs out we know that the 7 minute hourglass has run for 4 minutes also and so must have 4 minutes of sand in the bottom.
If we flip it now it will necessarily run for 4 minutes. Bringing it together We already have a solution. We said if we start them both together and Mihutes the 4 minute hourglass every time it runs out the difference between the 7 minute hourglass ending and the and the 4 minute hourglass ending for the second time is 1 minute. As shown: Clearly though a better solution would be one that didn't require us to wait 7 minutes before we start.
And there is a solution that allows this. We need to add 2 minutes on to the end of the 7 minute hourglass. Since the twice-flipped 4 minute hourglass will stop at 8 minutes we can flip our Egg Timer 5 Minutes minute hour glass here for the second time.
At this point it will have been running for 1 minute, we will flip 1 minute's worth of Egg Timer 5 Minutes back to the top Minutees it will run for another 1 minute. This will total 9 minutes. As shown: Not sure how to rate this Timeer difficulty. But prior to that it seems very hard. Where next? PayPal I always think it's arrogant to add a donate button, but it has been requested. If I help you get Ti,er job though, you could buy me a pint!
This puzzle comes to me via the same source as the previous four.
mensday.ws is a simple, online countdown timer or egg timer. Set a time and bookmark it for repeated use. You can also create a timer for a specific date or time. Customize your experience with a variety of timer .
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