Write the Rate as a Fraction in Simplest Form $\frac { 9 \text { miles } } { 1 \text { minute } }$

Write the rate as a fraction in simplest form.
-180 miles in 20 minutes

A) $\frac { 9 \text { miles } } { 1 \text { minute } }$
B) $\frac { 1 \text { mile } } { 9 \text { minutes } }$
C) $\frac { 180 \text { miles } } { 20 \text { minutes } }$
D) $\frac { 45 \text { miles } } { 5 \text { minutes } }$