This question has two different measurements, time and distance. You can't compare the two.
She can run 3.75 miles in 15 minutes.
1.875 MILES IN 15 MINUTES
In 18 minutes, you can travel 15 miles. To find out how many miles you can travel in 54 minutes, you would divide 54 by 18 to get 3 (54/18=3), then multiply 15 miles by 3 to get 45 miles in 54 minutes.
15 minutes.
15 MPH1 mile / 4 minutes x 15 /15 = 15 miles / 60 minutes ... or ... 15 miles / 1 hour.
(10/15) x (60 minutes per hour) = 40 minutes
10 miles.
3 miles in 22 2 minutes is the same speed as 15 miles per 110 minutes.
If you drive 37 miles in 15 minutes then in 1 hour (which is 4 x 15 minutes) you drive 4 x 37 = 148 miles. Your speed is therefore 148mph.
15 hours 20 minutes at 60 mph
252 miles in 5 hours and 15 minutes = 48 mph
15 minutes.