选择题
2002 AMC 8 Problem 18: Skating Average
Gage skated 1 hr 15 min each day for 5 days and 1 hr 30 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?
A.
1 hr
B.
1 hr 10 min
C.
1 hr 20 min
D.
1 hr 40 min
E.
2 hr