conversations.from: human
conversations.value: Solve the math problem: Karen is paddling her canoe up a river against the current. On a still pond, Karen can paddle 10 miles per hour. The river flows in the opposite direction at 4 miles per hour. If the river is 12 miles long, how many hours will it take Karen to paddle up it?
conversations.from: assistant
conversations.value: First find Karen's net speed by subtracting the speed of the current: 10 mph - 4 mph = 6 mph
  Then divide the length of the river by Karen's speed to find how long it takes her to paddle up it: 12 miles / 6 mph = 2 hours