conversations.from: human
conversations.value: Find the answer to the math problem: If it takes 3 kangaroos traveling at the same speed a total of 18 hours to travel across a highway, how many hours will it take four turtles, each traveling at half the speed of a kangaroo, to do so?
conversations.from: assistant
conversations.value: If it takes 3 kangaroos traveling at the same speed, a total of 18 hours to travel across a highway, one kangaroo takes 18/3= 6 hours to cross the highway.
  A turtle traveling at half the speed of a kangaroo will take 2*6 = 12 hours to cross the highway.
  Four turtles will take a total of 4*12 = 48 hours to travel across the highway.