The characteristic curves of two mine fans installed in series in a fan drift are $P = 2000 - 6Q - 0.2Q^2$ and $P = 3000 - 8Q - 0.2Q^2$ where P is pressure in Pa and Q is quantity in m$^3$/s. If the mine quantity is 70 m$^3$/s, the mine resistance, in Ns$^2$m$^8$, (rounded off to two decimal places) is ______.