The Dynac Manufacturing Company produces a particular product in an assembly line operation. One of the machines on the line is a drill press that has a single assembly line feeding into it. Partially complete units arrive at the press at a rate of 24 units per hour, and at any given time there is an average of 9 units at this work station. What is the average time a unit spends at the drill press station? Express your answer in minutes, round to two decimals of needed.