A zookeeper weighed an African elephant to be 9 times 10 to the third power pounds and an African lion to be 4 times 10 to the second power pounds. How many times greater is the weight of the elephant than the weight of a lion? A: 2.25 times 10 to the 1rst power B: 5 C: 13 times 10 to the 5th power D: 3.6 times 10 to the 6th power