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study-resources/questions-and-answers/81118/inspector-carol-ketchum-is-in-pursuit-of-a-midnightchemical-truck-that-has-spread-waste-solvents-mostly-cis-12-dichloroethene-in-a-uniform-layer-2-mmthick-on-the-roadway-she-arrives-20-min-after-the-truck-has-finished-emptying-its-load-is-she-in-timeto-collect-any-evidence-from-the-road-assume-wind-speed-is-3-ms