reading #39-pracice problem #5 increase, suppliers, something, collection

atate2007

Can anyone shed some light on this problem for me. Or rather the solution they have on the back of the book. It says that if a company's increase in days payable from 35 to 40 days increased, it SHORTED ITS CASH COLLECTION CYCLE, thus contributing to liquidity. I thought that an increase in taking time to pay suppliers decreases liquidity. am i missing something. and how does that shorten it's cash collection cycle.