conversations.from: human
conversations.value: Betsy and Donovan made a meal together. Betsy's part took 18 minutes longer than Donovan's part. The meal was made in 98 minutes. How many minutes long was Betsy's part?
  Work out the solution step by step.
conversations.from: assistant
conversations.value: Let D = Donovan's time in minutes
  Betsy = D + 18
  2D + 18 = 98
  2D = 80
  D = 40
  Betsy = 40 + 18 = 58 minutes
  Betsy's part took 58 minutes.