Answer:
41 years
Step-by-step explanation:
The Colosseum also known as Flavian Amphitheatre is located at the centre of Rome, the capital of Italy. It is oval shaped and was built by the Flavian emperors with a capacity of 50,000 to 80,000 spectators. The building started in 70 AD and was finished in 80 AD
The Hadrian wall also known as the roman wall was built by emperor Hadrian. The building started in 122 AD and was completed in 128 AD.
Hence the time between the completion of the Colosseum and the building of the Hadrian wall is from 80 AD to 122 AD which is about 41 to 42 years