four buses leave from the same bus terminal at different times. Bus A leaves at 9 a. m. for town A, 330 km away. Bus B leaves at 11 a. m. for town B, 250 km away. Bus C leaves at 1 p. m. for town C, 155 km away. Bus D leaves at 1:30 p. m. for town D, 95 km away. Bus A travels at an average speed of 75 km/h, Bus B travels at an average speed of 60 km/h, and buses C and D both travel at an average speed of 85 km/h. Which bus arrives last? (HINT: this is 4 separate x= vt problems. Figure out how much time each one takes. Then figure ou when each will arrive, given the starting times.)