Chloe drove 48 miles in 1 hour and 12 minutes. We want to convert this to miles per hour. Let's convert 12 minutes to hours. There are 60 minutes in an hour, so:
[tex]\sf\dfrac{12}{60}=0.2[/tex]
So 12 minutes is 0.2 hours. Chloe drove 48 miles in 1.2 hours. We can divide the number of miles she drove by the time it took her to drive it.
[tex]\sf 48\div 1.2=\boxed{\sf 40~mph}[/tex]
