Deluxe river cruises operates a fleet of river vessels. The fleet has two types of vessels: A type -A Vessel has 60 deluxe cabins and 160 standard cabins, whereas a type B vessel has 80 deluxe cabins and 120 standard cabins. Under a charter agreement with Odessy Travel agency, deluxe river cruises is to provide Odessy with a minimum of 360 deluxe and 680 standard cabins for their 15-day cruise in May. It costs 48,000 to operate a type-A vessel and 58000 to operate a type-B vessel for that period. How many of each type of vessel (x type-A and y type-B) should be used in order to keep the operating costs to a minimum?