"Queremos hablar español."
Translation:We want to speak Spanish.
We have already conjugated querer (queremos, we want). The second verb won't be conjugated in Spanish or in English (hablar, to speak).
We want to speak = Queremos hablar
They are going to study = Van a estudiar
I have to cook = Tengo que cocinar
i put we want to talk and it said incorrect and it said speak and put talk wrong
Although hablar = to speak, to talk, they are not always interchangeable. For example, we tend to say speak with the name of a language, not talk.
I believe both should be accepted since meaningwise they are about the same. Even though talk is used in connotation "talk to somebody" and speak is used more when you are having a monologue. The thing is I don't see an equivalent for both words in Spanish and therefore, what's the difference
You have said the answer yourself. Talk is used with a conversation, speak is used for one-sided conversation. In Spanish, there is no distinction, but in English there is. Speak is the only verb that we use to name a language that we use.