Hello!
We have to find how fast the car goes a minute
To find this we can do 57/60 since the car goes 57 miles an hour and there are 60 minutes in an hour
This gives us 0.95 miles a minutes
Then we do how fast the car goes a minute by the amount of minutes
So 0.95 * 15 = 14.25
The car goes 14.25 miles in 15 minutes
Hope this helps!