If a runner maintains a constant speed of 12 miles an hour how long will it take to complete a half marathon race of 13.1 miles?

At 12 mph, how long does it take to go 13.1 miles?

We know that distance = rate * time

So we know that 13.1 = 12 * time

We can now see that time = 13.1/12 = 1.092 (hours)

That's approximately 1 hour and. 092*60=5.52 minutes.