Correct answer is... 7 m. It is equal to 23 ft. Larger aircraft length is often connected to higher passangers or cargo capacity of an aircraft. The longest civil aircraft is 84 m (275 ft) long, so Auster J family has 8% percent of it's length. Typical jet airliners has about 35m, so in the comparision Auster J family has 8% of aircrafts like B737 or A320.
Disclaimer: Our articles and data connected to length of Auster J family are based on public data from various sources. We are very picky to select an reliable data providers, but we cannot guarantee that everything is 100% error-proof. We recommend for any serious purpose - as a rule of thumb - to request offical data about length from manufacturer of Auster J family.