The air in a 43 cubic metre kitchen is initially clean, but when Geoff burns his toast while making breakfast, smoke is mixed with the room's air at a rate of 0.03 mg per second. An air conditioning system exchanges the mixture of air and smoke with clean air at a rate of 6 cubic metres per minute. Assume that the pollutant is mixed uniformly throughout the room and that burnt toast is taken outside after 34 seconds. Let 3(t) be the amount of smoke in mg in the room at time t (in seconds) after the toast first began to burn. , Check the level of pollution in mg per cubic metre after 34 seconds by entering your answer here, correct to at least 10 significant figures (do not , The time, in seconds, when the level of pollution falls to 0.006 mg per cubic metre is :] . l3 seconds (correct to at least 10 significant gures). Note that this check asks for the time since if = 0 but the question part (d) asks for a time since the toast was taken outside