2. The graph shows that P litres of petrol are consumed by a car to travel D km. Distance travelled (D km 50 -40 30 20 10 he is left with after s, copy and complete 0 2. 3 4. 5 6 Petrol used (P litres) - on the horizontal Use the graph to find (a) how far the car can travel if it has (i) 3 litres of petrol, (ii) 5.2 litres of petrol, (b) the cost of petrol required to travel 36 km, given that 1 litre of petrol costs $1.40.