Formulate the order-to-courier matching problem for a delivery platform

A food delivery platform receives orders continuously and has couriers on the road. Today each new order goes to the nearest free courier as soon as it arrives. Management asks whether a smarter matching approach is worth building. (a) Formulate the matching problem for one batch of orders and couriers. (b) Estimate how much a better approach might save, and what you would measure. (c) Name the constraints and the practical issues that make it harder than the textbook model.