desiree ramirez is a scuba diver and plans to spend 5 hours underwater during her five day vacation. She makes two dives each day. On the first day, the duration of her dives was 1/2 hour and 2/3 hour; the second, 3/4 and 1/3 hour. The third day, 5/6 and 1/2 hour; the fourth day, 2/3 and 1/4 hour. How long must she spend on the fifth day to achieve her goal?