[Answer] Old Faithful is a geyser there, how often does it erupt?

Step 1 : Introduction to the question "Old Faithful is a geyser there, how often does it erupt?"

...1. Every 90 minutes
2. Every 90 seconds
3. Every 90 hours
4. Every 90 days

Step 2 : Answer to the question "Old Faithful is a geyser there, how often does it erupt?"

Every 90 minutes:

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