conversations.from: human
conversations.value: John's car gets 30 mpg.  He drives 20 miles to work each way 5 days a week.  He also drives another 40 miles a week for leisure travel. How many gallons of gas does he use a week?
  Can you solve this problem?
conversations.from: assistant
conversations.value: He drives 20*2=40 miles per day for work
  So he drives 40*5=200 miles for work
  So he drives a total of 200+40=240 miles per week
  That means he uses 240/30=8 gallons of gas a week