Two masses of 3.4 kg and 2.5 kg are accelerated from an initial speed of 5 m/s and 12 m/s, respectively. The distances traversed by the masses in the 5$$^{\text{th}}$$ second are 104 m and 129 m, respectively. The ratio of their momenta after 10 s is $$\frac{x}{8}$$. The value of $$x$$ is __________.