A factory gets an urgent order to manufacture a certain item. It has three machines A, B and C capable of producing the particular item. The machine A can complete the entire order in 4 hours and the machines B and C can do the same in 5 and 6 hours respectively. The factory manager decides to utilize all three machines to get the order completed and he starts all three machines at the same time. Exactly after 1 hour, the machine B breaks down and stops working. How much longer will the other two machines take to complete the work?