$(8$ pts$.)$ After skidding down a snow$-$covered hill on an inner tube, Ashley is coasting across a level snowfield at a constant velocity of $+1\mathrm{.}9\frac{m}{s}.$ Miranda runs after her at a velocity of $+4\mathrm{.}5\frac{m}{s}$ and hops on the inner tube. How fast do the two of them slide across the snow together on the inner tube? Ashley's mass is $60$ kg $,$ and Miranda's is $50$ kg $.$ Ignore the mass of the inner tube and any friction between the inner tube and the snow.

Nose