A 500-gallon tank originally contains 100 gallons of fresh water.  Beginning at time t = 0, water containing industrial waste is pumped into  the tank at the rate of 2 gal/min, and the well-stirred mixture leaves at the  rate of 1 gal/min. Find the concentration of industrial waste in the tank at  the moment it overflows.  Use Integrating Factors

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Storm Sewers and Detention

The storm drains system transports rainwater or stormwater and other runoff from roads, parking lots, and roof downpipes directly to nearby creeks, rivers, or the sea without any treatment.