conversations.from: human
conversations.value: John starts at an elevation of 400 feet.  He travels downward at a rate of 10 feet down per minute for 5 minutes.  What is his elevation now?
  Give me a clear explanation.
conversations.from: assistant
conversations.value: He traveled down 10*5=50 feet.
  So he is at an elevation of 400-50=350 feet.