Bianca drove at 60 miles per hour for 1 1/2 hours. collin drove 150 miles in 2 1/2 hours and dale drove 105 miles in 1 3/4 hours. which statement about the drivers' rates of speed is true? a. dale had the fastest average rate of speed. b. collin had the fastest average rate of speed. c. bianca had the fastest average rate of speed. d. all three had the same fastest average rate of speed.