A truck delivered sand to two customers in a week. The following details are available. Customer Weight of goods delivered Distance covered (kilograms) (kilometres) X 500 200 Y 180 1,200 total 680 1,400 The truck cost $3,060 to operate in the week. Each customer delivery was carried separately, and the truck made no other deliveries in the week.
What is the cost per kilogram/kilometre of sand delivered in the week (to the nearest $0•001)?