A bus leaves a terminal traveling at a rate of 45 miles per hour. When the bus has traveled 90 miles, a car leaves the same terminal, traveling at a rate of 60 miles per hour. Which pair of equations model the distances d covered by each vehicle after t hours?
A. Bus: d1 = 45t + 90; Car: d2 = 60t.
B. Bus: d1 = 60t; Car: d2 = 45t – 90.
C. Bus: d1 = 60t + 90; Car: d2 = 45t.
D. Bus: d1 = 45t + 90; Car: d2 = 60t + 90.