Hey there!
If they drive 4.5 miles in 1/10 of an hour, we need to multiply that by 10 to get the amount of miles they'd drive in an hour at that rate because 1/10 x 10 = 1.
4.5 x 10 = 45
They are driving 45 miles per hour.
Hope this helps!
7.3m questions
9.7m answers