A certain car factory used to produce 12 cars in 15 hours. Due to a decrease in sales, the CEO has cut the factory hours down to 10. Which equation can the CEO use to find out how many car, c, the factory is able to produce in a 10-hour day?

A. 15/12 = 10/c
B. c/15 = 12/10
C. c/12 = 15/10
D. 12/15 = 10/c

B. c/15 = 12/10