After skidding down a snow-covered hill on the inner tube, Ashley is coasting across a level snowfield at a constant velocity of +2.5 m/s. Miranda runs after her at the velocity of +5.2 m/s and hops on the inner tube. Determine how fast do the 2 of them slide across the snow altogether on the inner tube? The mass of Ashley is 70 kg, and Miranda's is 43 kg. Avoid the mass of the inner tube and any friction connecting the inner tube and the snow.