conversations.from: human
conversations.value: Rodney and Todd are rowing down a river that is 50 yards wide at one end. If the river's width increases from this end uniformly by 2 yards every 10 meters along, and they row along the river at a rate of 5 m/s, how long (in seconds) will it take them to get to the point where the river is 80 yards wide?
  Give me a detailed solution.
conversations.from: assistant
conversations.value: The difference in width between where they're starting from and their destination is 80-50 = 30 yards
  The width increases 2 yards every 10 m along the river so they would have to cover (30/2)*10 = 150 meters
  Traveling at the rate of 5m/s, he will spend 150/5 = 30 seconds