One day Sadie and Gohil both buy petrol and oil from the same petrol station. Sadie buys 30 litres of petrol and 4 litres of oil. Sadie pays a total £46.00 Gohil buys 24 litres of petrol and 8 litres of oil. Gohil pays a total of £45.20 Find the cost of one litre of petrol and the cost of one litre of oil.​