Answer
56.25 minutes
Work Step by Step
The racetrack is 2.5 miles long. The race had 30 cautionary laps. The cautionary race was a total of $2.5*30=75$ miles.
The speed is 80 miles per hour. So $ \frac{75}{80}=0.9375$ hours.
In minutes, $0.9375*60=56.25$ minutes
