conversations.from: human
conversations.value: Find the answer to this math problem: Chris has a two-speed lawn mower. He can mow his entire lawn in "turtle" mode in 1 hour, or 40 minutes in "rabbit" mode. Today, he experimented by mowing half in turtle mode and half in rabbit mode. How many minutes did it take him to mow the lawn?
conversations.from: assistant
conversations.value: He spends 60/2=30 minutes in turtle mode
  He spends 40/2=20 minutes in rabbit mode
  He took 30+20=50 minutes to mow the lawn.