conversations.from: human
conversations.value: During a race transmitted on television, five advertisements were shown, lasting 3 minutes each. One minute of advertising costs $4000. What was the cost of transmitting these advertisements during the race?
conversations.from: assistant
conversations.value: During the race, there were five ads, lasting 3 minutes each, so in total, they lasted 5 * 3 = 15 minutes.
  So the total cost of these ads was 15 * 4000 = $60000.