Two parallel elevators at rest are 125 meters apart. The two will approach each other from their initial positions. The upper elevator has a constant downward acceleration of 0.75 m/s2 and the lower elevator has an upward constant acceleration of 1.5 m/s2. If the lower elevator starts 3 seconds after the upper elevator, determine: (a) the total time of travel for the upper elevator (b) the total distance traveled by the upper elevator (c) the velocity of the upper elevator when passing the lower elevator