How does the sentence "By the time he reached the seventeenth floor, which seemed to take forever, he was winded and gasping?" use dependent, independent, and adjective clauses?

2 answers

Actually I want to know what they are in the sentence.
Dependent clause:
"By the time he reached the seventeenth floor, which seemed to take forever,"

Independent clause:
"he was winded and gasping"

Adjective clause:
"which seemed to take forever"