[Figure showing a cuboid tank with length 1.2, width 0.6, and height h. Labelled 'NOT TO SCALE'.] The diagram shows a tank. The tank is a cuboid with length 1.2 m, width 0.6 m and height h m. The volume of the tank is 1.8 m³.

1. (a)(i)Calculate the value of h.[2]
2. (a)(ii)Fuel is pumped into the empty tank at a rate of 0.2 m³ per minute. Calculate the time taken to fill the tank to 90% of its volume. Give your answer in minutes and seconds.[3]
3. (b)[Figure showing a prism tank with an open top. The cross-section is trapezium ABCD. AB is parallel to CD. AD = 70, BC = 70, CD = 80, AB = 110. The base of the tank is a square. Labelled 'NOT TO SCALE'.] The diagram shows a tank with an open top. The tank is a prism with trapezium ABCD as its cross-section. AD = BC = 70 cm, CD = 80 cm and AB = 110 cm. The base of the tank is a square. Calculate the total surface area of the outside of the tank.[5]

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