Another one: in March, GPT-4 was able to answer this question, and GPT3 got confused. Now, both fail : “How can you time 9 minutes using a 4-minute hourglass and a 7-minute hourglass?”

“User
How can you time 9 minutes using a 4-minute hourglass and a 7-minute hourglass?

ChatGPT
You can time 9 minutes using a 4-minute hourglass and a 7-minute hourglass as follows:

Start both hourglasses at the same time.

After 4 minutes, the 4-minute hourglass will run out. Immediately flip the 4-minute hourglass to restart it.

After 3 more minutes (7 minutes in total), the 7-minute hourglass will run out. At this point, don’t do anything yet.

After 1 more minute (8 minutes in total), the 4-minute hourglass will run out (for the second time). Immediately flip the 4-minute hourglass again.

After 1 more minute (9 minutes in total), the sand in the 4-minute hourglass will have been running for 1 minute since you flipped it last. At this point, you’ve measured 9 minutes.

User
Comment tu attends la minute du point 5?

ChatGPT
Dans cette stratégie, nous n’avons pas de moyen précis pour mesurer une minute lors de l’étape 5. Cependant, l’heure de cette minute est déduite du processus entier. Voici comment cela fonctionne :

Commencez les deux sabliers en même temps.

Après 4 minutes, le sablier de 4 minutes sera épuisé. Retournez immédiatement le sablier de 4 minutes.

Après 3 minutes supplémentaires (7 minu