conversations.from: human
conversations.value: This math problem has got me stumped: A train travels between 3 different cities.  It goes 75 miles from the first city to the second city, 100 miles from the second city to the third city, and 50 miles less than that combined distance to go from the third city to the first city.  It does this trip 3 times a day.  The train needs service every 18,000 miles so how many days does it go between services?
  Can you show me the way?
conversations.from: assistant
conversations.value: It takes 100+75=175 miles for the first two legs of the trip
  The third leg is 175-50=125 miles
  So the total trip is 175+125=300 miles
  So it goes 3*300=900 miles per day
  So it can go 18000/900=20 days between services.