After sliding down a snow-covered hill on an inner tube, Ashley is coasting across a level snowfield at a constant velocity of +2.6 meter per second. Miranda runs after her at a velocity of +4.2 meter per second and hops on the inner tube. Determine how fast do the two of them slide across the snow together on the inner tube? Ashley's mass is 74 kilogram and Miranda's is 55 kilogram. Neglect the mass of the inner tube and any friction between the inner tube and the snow.