conversations.from: human
conversations.value: John drives to his friend's house 200 miles away.  He drives at a speed of 70 mph.  He had to take a detour that added 10 miles to his trip.  After he gets there he takes a route home that is 240 miles but he goes 80 mph.  How long did the trip take?
  Give me a detailed solution.
conversations.from: assistant
conversations.value: The first leg was 200+10=210 miles
  So he drove 210/70=3 hours
  The second route took 240/80=3 hours
  So in total he drove 3+3=6 hours