✅ Answer: 60 minutes (1 hour)
You take the 1st pill at 0 minutes.
You take the 2nd pill at 30 minutes.
You take the 3rd pill at 60 minutes.
That’s 2 intervals of 30 minutes, not 3. Most people say 90 minutes because they multiply 3 pills by 30 minutes. But the first pill doesn’t require any waiting — you take it immediately.
This is called the fencepost problem: if you have 3 fence posts, you only have 2 gaps between them. It’s one of the most common logical errors in everyday life.
Final score: __/7
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