A car is moving at 72km h−1 on a dry, level road. The coefficient of static friction between the tyres and the road is μs=0.60, while the coefficient of kinetic friction is μk=0.40. Ignoring air resistance, what is the ratio of the shortest stopping distance with the wheels locked (skidding) to that with the wheels rolling without slip?
a) 0.67
b) 1.25
c) 1.5
d) 1.33