hope this helpshere goes : (any help appreciated)
a) when driven in town, a car runs at x kilometres on each litre of petrol
(i) find in terms of x , the number of litres of petrol used when the car is driven 200km in town
number of Liters, V = 200/x
(ii) when driven in town , the car runs (x+4) kilometres on each litre of petrol to go 200km out of town than to go 200km in town. Use this information to write down an equation involving x , and show that is simplifies to :
x^2 + 4x - 160 = 0
the bold statement makes little sense to me ... I understand that in town the car gets x km/L and out of town the car gets (x+4) km/L ... recheck the exact wording.
b) solve the equation x^2 + 4x - 160 = 0
since x represents km,
c)Calculate total volume of petrol used when the car is driven 40km in down and then 120km out of town.