An automobile weighing 15 kN is moving at a speed of 100 km per hour. The dynamic coefficient of friction between the rubber tyre and concrete road is 0.60. When the driver jams on his brakes, the car goes into skid in the direction of motion. What is the distance the car will move before it comes to rest when (i) the road is flat, (ii) the road is 7 upward inclination, (iii) the road is 7 downward inclination?