conversations.from: human
conversations.value: A boy runs 1.5 km in 45 minutes. What is his speed in kilometers per hour?
conversations.from: assistant
conversations.value: Since 1 hour is equal to 60 minutes, then 45 minutes is equal to 45/60 = 0.75 hours.
  Then, the speed in kilometers per hour is 1.5 km/0.75 hour = 2 kilometers per hour.