A plate and frame are floated on the press. In the filtration process, 8 m3 of filtrate is collected in 1800 s and 11 m3 in 3600 s. The resulting pasta was washed with 3 m3 of water. Washing speed at constant pressure difference is 14 of filtration usage. You can neglect the resistance of the filtration medium. Filtering and washing processes are under constant pressure property. Find the washing costs.