The diagram shows an empty tank in the shape of a cylinder.

The cylinder has radius 12 cm and height 45 cm.
Water flows into the tank at a rate of 1.8 litres per minute.
Calculate the number of minutes it will take to completely fill the tank. Give your answer correct to the nearest minute.
92 exam-style questions on AQA GCSE Maths Cylinders. Each one has a worked solution and a mark scheme showing where the marks go.