conversations.from: human
conversations.value: John is very tired. He decides to take a nap, but he wants to finish his homework first. If John has 20 minutes of math homework, 40 minutes of reading homework, and 20 minutes of history homework and 3 hours before he has to eat dinner, how many minutes does John have to nap?
  Give me a solution to this problem
conversations.from: assistant
conversations.value: John has to spend 20+40+20 = 80 minutes on homework.
  John has 3 hours*60 minutes= 180 minutes before dinner.
  Thus, John has 180-80=100 minutes for his nap.