Within minutes, they had their equipment packed. They were off!

Combined sentence: Within minutes, they had their equipment packed and were off!
Does the combined sentence use a compound subject, compound verb, or
compound object?

sorry its english

Subject: they

Verbs: had packed, were
Object: equipment

So its compound subject huh?

The combined sentence, "Within minutes, they had their equipment packed and were off!" contains a compound verb. In this case, the compound verb is "had their equipment packed and were off", which includes two actions joined together: "had their equipment packed" and "were off".