Consider the air over a city to be a box 100 km on a side that reaches up to an altitude of 1.0 km. clean air is blowing into the box along one of its sides with a speed of 4 m/s. suppose an air pollutant with a degradation reaction rate k = 0.2 hr-1 is emitted into the box at a total rate of 10.0 kg/s.
1. if the windspeed in this above problem suddenly drops to 1 m/s, estimate the concentration of the pollutant two hours later.