A van delivered wood to two firms in a week. The following details are available:

Firm P$-200$ kg delivered; distance travelled $250$ km Firm Q $-500$ kg delivered; distance travelled $800$ km

The van costs $$675,000$ to operate for the week. Each delivery was carried separately and there were no other deliveries during the week.

What is the cost per kg$/$km of wood delivered in the week $($ to the nearest $$0\mathrm{.}01)?$

$1.$ $$642\mathrm{.}86$

$2.0\mathrm{.}92$

$3.964\mathrm{.}29$

$4.$ $$1\mathrm{.}50$