The visitors' section of a courtroom seats 105 people. The court is in session 6 hours of the day. On one particular day, 486 people visited the court and were given seats. What is the average length of time spent by each visitor in the court? Assume that as soon as a person leaves a seat it is immediately filled and that at no time during the day is one of the 105 seats vacant. Express your answer in hours and minutes.