Final answer:
To find the unit rate of miles per hour for Owen's bike ride, divide the total distance by the time taken, resulting in 15 miles per hour.
Step-by-step explanation:
The question asks us to calculate the unit rate at which Owen rides his bike in terms of miles per hour. To find the unit rate of miles per hour, we divide the total distance by the total time. In this case, Owen rides his bike 60 miles in 4 hours. So, the unit rate is 60 miles divided by 4 hours, which is 15 miles per hour.
To find this unit rate, we divide the total number of miles traveled by the total number of hours it took. So, the calculation would be 60 miles divided by 4 hours, which equals to 15 miles per hour (b) 15 mph). Therefore, the correct answer is b) 15 mph.