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A certain pesticide is fatal to fish fingerlings

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A certain pesticide is fatal to fish fingerlings at a level of 0.5 parts per million in water. A leaking metal can containing 9.0 kg of the pesticide was dumped into a stream with a flow of 10.0 Liters per second moving at 0.4 km/hr. The container leaks pesticide at a constant rate of 5.0 mg/sec. For what distance (in km) downstream is the water contaminated by fatal levels of the pesticide by the time the container is empty?

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