I will give you the book questions and my answers and please tell me if they are correct ..

1-that apartment has two rooms.(what kind of apartment is it?)
It is a two -room apartment .

2- that bridge is ten metres wide.(what kind of bridge is it ?)
It is a ten-metre-wide bridge .

3- this lesson lasts for 45 minutes.(what kind of lesson is it?)
It is 45 -minute lesson .

4- his family has three cars.(what kind of family is it?)
can you tell me the answer .. :(

5- our watch counts 24 hours everyday.(what kind of watch is it?)
It is a 24 -hour watch .

6- our holiday lasts two weeks.(what kind of holiday is it?)
It is a 2 -week holiday .

7- that tent can hold three men.(what kind of tent is it?)
can you please tell me the answer .. :(

Thank you so much ..

three-car family
three-man tent

There's more on compound adjectives here.