conversations.from: human
conversations.value: Marissa is hiking a 12-mile trail. She took 1 hour to walk the first 4 miles, then another hour to walk the next two miles. If she wants her average speed to be 4 miles per hour, what speed (in miles per hour) does she need to walk the remaining distance?
  Give me a solution to this problem
conversations.from: assistant
conversations.value: First figure out how many hours it takes to hike a 12-mile trail at 4 mph by dividing the distance by the speed: 12 miles / 4 mph = 3 hours
  Next subtract the time Marissa already spent walking to find out how much time she has left: 3 hours - 1 hour - 1 hour = 1 hour
  Now figure out how much distance she has left by subtracting the distance she already traveled from the total distance: 12 miles - 4 miles - 2 miles = 6 miles
  Now divide the remaining distance by the remaining time to find out how fast in miles per hour Marissa has to travel: 6 miles / 1 hour = 6 mph