Write each phrase as a unit rate.
1. 20 mi in 5 h
a)4 mi/h
b)20 mi/5 h
c)5 mi/hr
d)100 mi/hr
2. 42 gal in 7 min
a)6 gal/min
b)7 gal/min
c)42 gal/7 min
d)35 gal/min
3. A fall of 144 ft in 3 s
a)0.02 ft/s
b)144 ft/3 s
c)141 ft/s
d)48 ft/s ...?