conversations.from: human
conversations.value: Explain how to solve this math problem: Jack has a grove with 4 trees by 5 trees.  It takes 6 minutes to clean each tree.  He gets help to clean the trees so it only takes half as long.  How many hours did he spend cleaning trees?
conversations.from: assistant
conversations.value: There were 4*5=20 trees to clean
  So it took 20*6=120 minutes
  That is 120/60=2 hours
  So he spent 2/2=1 hour cleaning