An acrylonitrile groundwater plume is 1000 meters from a river. The aquifer averages 20 m in depth and water table surface at the plume is 80 cm above the level of the river on average. The hydraulic conductivity of the aquifer is 9 x 10-3 m/sec. The porosity of the aquifer is 0.30.

a) How long will it take for the contaminant to reach the river (days)?