A certain pesticide is fatal to fish fingerlings at a level of 0.5 parts per million in water. A leaking metal can containing 10.0 kg of the pesticide was dumped into a stream with a flow of 10.0 Liters per second moving at 0.7 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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From the rate of release (5.0 mg/sec) and the rate of flow (10.0 L/sec) it's possible to get the concentration in mg/L.
1 part per million (ppm) would be 1 mg in 1 kg, or 1 mg in 1 L of water in this case. It doesn't matter much to the question, but you can check that the ...
The solution talks through the problem of finding how far down a river the water will contain fatal concentrations of pesticide after a leakage upstream. The thorough guidance ensures that questions of a similar nature may be tackled in the future.