The price of stock A at 9 a.m. was $12.42, increasing at the rate of $0.13 per hour. At noon, the price of stock B was $12.92, decreasing at the rate of $0.15 per hour. In how many hours will the prices of the two stocks be the same?
A) 5 hours
B) 6 hours
C) 7 hours
D) 8 hours