It took Liam 15 minutes to ride his bike three miles. Convert this ratio into a unit rate by finding how long many minutes did he take to travel one mile.
To find the unit rate, we need to divide the total time (minutes) by the total distance (miles).
Liam took 15 minutes to ride three miles.
So, the unit rate is 15 minutes / 3 miles = 5 minutes per mile.
Therefore, it took Liam 5 minutes to travel one mile.