QUESTION 5 A leaf filter has an area of 2 m² and operates at a constant pressure drop of 250 kPa The results in Table 1 were obtained during a test with an incompressible cake Table 1 Volume of filtrate versus time Volume of filtrate collected (litre) 280 430 540 680 800 Time (min) 10 20 30 45 60 Use the data provided in Table 1 to calculate the time required to collect 12 m² of filtrate at a constant pressure drop of 400 kPa with the same feed [18 marks]