conversations.from: human
conversations.value: A train takes 2 hours longer to go an equal distance of a car. If the car and the train leave station A at the same time, and the car reaches station B 4.5 hours later, calculate the combined time the car and the train take to reach station B.
  Can you solve this problem?
conversations.from: assistant
conversations.value: Since the train takes 2 hours longer to go an equal distance as the car, to reach station B, the train took 4.5+2 = 6.5 hours.
  Together, the train and the car take a total of 6.5+4.5 = 11 hours to travel from station A to station B.