It Can Be Shown That the Approximate Age of the Universe

Multiple Choice

It can be shown that the approximate age of the universe is $1 / H$ , where $H$ is the Hubble constant Taking $H = 20 \frac { \mathrm { km } / \mathrm { s } } { \mathrm { Mly } }$ , estimate the age of the universe, in years. (1 ly $\left. = 9.46 \times 10^{15} \mathrm {~m} \right)$

A) 15 billion years
B) 15 million years
C) 15 thousand years
D) 50 billion years