conversations.from: human
conversations.value: A truck driver has to spend $2 per gallon of gas. She can drive 10 miles per gallon. She drives at a rate of 30 miles per hour. If she is paid $.50 per mile, how much money does she make if she drives for 10 hours?
conversations.from: assistant
conversations.value: The truck driver drives for 10 hours at 30 miles per hour, so she drives 10*30=300 miles.
  Therefore, she needs 300/10=30 gallons of gas.
  This will cost her 30*$2=$60.
  She will make 300*$.50= $150.
  Thus, after paying for gas, she will make $150-$60=$90.