conversations.from: human
conversations.value: Can you break down the solution for me for this math problem: Colin ran his first mile in 6 minutes.  He ran his next two miles in 5 minutes each and finished his 4th mile in 4 minutes.  What was the average time it took him to run a mile?
conversations.from: assistant
conversations.value: His first mile was in 6 minutes, then 5 minutes, another 5 minutes and his final mile was 4 minutes so it took him 6+5+5+4 = 20 minutes
  It took 20 minutes to run 4 miles so his average time was 20/4 = 5 minutes per mile