conversations.from: human
conversations.value: Find the answer to the math problem: John drives for 3 hours at a speed of 60 mph and then turns around because he realizes he forgot something very important at home.  He tries to get home in 4 hours but spends the first 2 hours in standstill traffic.  He spends the next half-hour driving at a speed of 30mph, before being able to drive the remaining time of the 4 hours going at 80 mph.  How far is he from home at the end of those 4 hours?
conversations.from: assistant
conversations.value: When he turned around he was 3*60=180 miles from home
  He was only able to drive 4-2=2 hours in the first four hours
  In half an hour he goes 30*.5=15 miles
  He then drives another 2-.5=1.5 hours
  In that time he goes 80*1.5=120 miles
  So he drove 120+15=135 miles
  So he is 180-135=45 miles away from home