Write the Rate as a Unit Rate $75,600 \mathrm { ft } / \mathrm { min }$

Write the rate as a unit rate.
-An animal can move at 1260 feet per hour. Write this rate in feet per minute.

A) $75,600 \mathrm { ft } / \mathrm { min }$
B) $21 \mathrm { ft } / \mathrm { min }$
C) $81 \mathrm { ft } / \mathrm { min }$
D) $\frac { 7 } { 20 } \mathrm { ft } / \mathrm { min }$