conversations.from: human
conversations.value: Find a solution for this math problem: John decided to start rowing around a square lake.  Each side of the lake is 15 miles.  Jake can row at twice the speed he can swim.  It takes him 20 minutes to swim 1 mile.  How long, in hours, does it take to row the lake?
conversations.from: assistant
conversations.value: The perimeter of the lake is 4*15=60 miles
  He swims at a speed of 60/20=3 mph
  So he rows at a speed of 3*2=6 mph
  That means it takes him 60/6=10 hours to row around the lake