A net force of O N is the result of
forces.

The result of Balanced forces.

the total distance traveled by the car is

30km + 49km = 79 km .

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west