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

Here are the answers for the given units above. In order to get the answer, we need to simplify the values.
1. 20 miles in 5 hours, that would be option a. 4 miles/hour.
2. 42 gals in 7 minutes, that would be option a. 6 gals/minute.
3. 144 feet in 3 secs, that would be option d. 48 feet/second.
Hope these answers help.