conversations.from: human
conversations.value: Sam spends sixty minutes studying Science, eighty minutes in Math, and forty minutes in Literature.  How many hours does Sam spend studying the three subjects?
  Can you solve this problem?
conversations.from: assistant
conversations.value: The total number of minutes he studies the three subjects is 60 + 80 + 40 = 180 minutes.
  Therefore, Sam spends 180/60 = 3 hours.