Gage skated 1 \mathrm{hr} 15 \mathrm{~min} each day for 5 days and 1 \mathrm{hr} 30 \mathrm{~min} each day for 3 days. How long would he have to skate the ninth day in order to average 85 minutes of skating each day for the entire time?
Answer Choices
A. 1 \mathrm{hr}
B. 1 \mathrm{hr} 10 \mathrm{~min}
C. 1 \mathrm{hr} 20 \mathrm{~min}
D. 1 \mathrm{hr} 40 \mathrm{~min}
E. 2 \mathrm{hr}