A-LevelMathematicsDifferential equationsOct/Nov 2021Paper 3 Q1011 Marks
A large plantation of area 20 km² is becoming infected with a plant disease. At time t years the area infected is x km² and the rate of increase of x is proportional to the ratio of the area infected to the area not yet infected. When t = 0, x = 1 and dx/dt = 1.
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