US supermarket giant Walmart is asking employees to deliver online orders to customers on their way home from work in an attempt to close the gap with rival Amazon. Walmart, which employs about 1.5 million workers in its 4,700 US stores, said it “just makes sense” for them to deliver packages on the way home as 90 percent of Americans live within 10 miles of one of its stores. Walmart’s head of e-commerce operations said the scheme would cut shipping costs, increase speed of delivery and allow workers to earn extra cash. The company has been testing the new delivery process with workers at three stores for the past month, but did not offer details about where or when the plan would be expanded across the US. The “last mile” of deliveries, when packages are driven to customers’ homes, are often most expensive part of the online delivery process and a challenge that many supermarkets and delivery companies are trying to solve.