It takes 8 high school students, working at identical constant individual rates, 10 hours to paint a certain house. At what time will the house be fully painted if 8 students start painting at 9:00 am and one student, working at the same rate, is added per hour starting at 2:00 pm? Choose the correct option:
A) 5:10 pm	B) 5:30 pm	C) 5:50 pm	D) 6:10 pm	E) 6:30 pm
Each student paints at a rate of 1/80 of the house per hour.   In 5 hours, the 8 students can paint 40/80 of the house.   From 2 pm to 3 pm, 9 students paint another 9/80 for a total of 49/80.   From 3 pm to 4 pm, 10 students paint another 10/80 for a total of 59/80.   From 4 pm to 5 pm, 11 students paint another 11/80 for a total of 70/80.   12 students can paint the remaining 10/80 of the house in 10/12 of an hour = 50 minutes.   The house is completed at 5:50 pm.   The answer is 5:50 pm.
<result>C</result>
It takes 8 high school students, working at identical constant individual rates, 10 hours to paint a certain house. At what time will the house be fully painted if 8 students start painting at 9:00 am and one student, working at the same rate, is added per hour starting at 2:00 pm?