The train shown is traveling at a speed of 140 mph km/h when the brakes are fully applied on the wheels of cars B and C in order to slow the train to 50 mph. The brakes are not applied on the wheels of car A. Knowing that the coefficient of kinetic friction is 0.50 between the wheels and the track, determine (a) the distance required to slow the train, (b) the time required to slow the train and (c) the force in each coupling.