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Q3. A ship of 120 m in length has the following particulars when floating in sea water of density 1025 kg/m³.

Displacement = 10560 tonne

draught aft = 6.93 m

draught forward = 6.58 m

longitudinal metacentric height (GML) = 125 m

centre of flotation from midships (LCF) = 2.4 mf aft

tonnes per centimetre immersion (TPC) = 19.9

Two tanks, each containing a substantial quantity of water ballast, are situated with their centres of gravity 30 m aft of midships and 55 m forward of midships. The vessel is required to enter dock with draught aft 6.60 m and a trim of 0.50 m by the stern.

Calculate the amount of ballast to be discharged from EACH tank. (16)