conversations.from: human
conversations.value: Find the answer to the math problem: Kevin is taking a 600-mile trip, traveling at a rate of 50 miles per hour. How much faster must he travel to decrease his travel time by 4 hours?
conversations.from: assistant
conversations.value: First find his current travel time 600 miles / 50 miles per hour = 12 hours.
  12 hours - 4 hours = 8 hours desired travel time
  600 miles / 8 hours = 75 miles per hour.
  75 miles per hour - 50 miles per hour = 25 miles per hour faster