conversations.from: human
conversations.value: Aren’s flight from New York to Hawaii will take 11 hours 20 minutes.  He spends 2 hours reading, 4 hours watching two movies, 30 minutes eating his dinner, 40 minutes listening to the radio, and 1 hour 10 minutes playing games.  How many hours does he have left to take a nap?
  Work out the solution step by step.
conversations.from: assistant
conversations.value: The flight from NY to Hawaii will take 60 x 11 + 20 = 680 minutes.
  All the activities will take 120 + 240 + 30 + 40 + 70 = 500 minutes.
  For his nap, he has 680 - 500 = 180 minutes.
  To convert minutes to hours, he has 180/ 60 = 3 hours.