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.
You can travel 45 miles in 54 minutes at that pace.
100
66.7 mph
0.25
32 mph
4 mph
131/3 mph
It would work out as 45 miles per hour
45 minutes.
15 minutes.