Lilah is moving from Portland to Seattle. It takes her three hours to go by train. Mason leaves the train station in Portland and drives to the train station in Seattle with all Lilah’s boxes in his car. It takes him 2.4 hours to get to Seattle, driving at 15 miles per hour faster than the speed of the train. Which equation could be used to solve this problem, if t is the speed of the train? A. a. 3(t + 15) = 2.4t

B. b. 3t = 1.4(t - 15)

C. 3(t - 15) = 2.4t

D. 3t = 2.4(t + 15)