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?
The difference in width between where they're starting from and their destination is 80-50 = <<80-50=30>>30 yards
The width increases 2 yards every 10 m along the river so they would have to cover (30/2)*10 = <<(30/2)*10=150>>150 meters
Traveling at the rate of 5m/s, he will spend 150/5 = <<150/5=30>>30 seconds
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