Question

The average speed was fastest in the interval **[4, 7]** at 67 mph.

Answer 1

It looks like you're stating an average speed for a specific time interval, which is **[4, 7]**, where the average speed is 67 mph. If you have further details or a specific question related to this information, feel free to provide more context! Whether you're looking for additional calculations, comparisons, or any specific assistance, I'd be happy to help.