20 mph
15 miles in 225 minutes = 1 mile in 15 minutes = 4 miles per hour
To go 15 miles in 45 minutes she could go 20 miles per hour. She should plan on arriving a at least 15 minutes early though, which means 40 miles/hour.
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.
100
66.7 mph
0.25
4 mph
32 mph
131/3 mph
It would work out as 45 miles per hour
15 minutes.
45 minutes.