You : To my school? No, it's too far to walk..
Your friend: Well, what about a taxi instead?
You: . It's too expensive.
Your friend : OK. Thanks!
You: Oh wait, I have one more question.
Your friend: ¿What's the matter?
You: ¿Is really school very far?
Your friend: Yes, it is.
You: ¿How much do you think i've to walk?
Your friend: about 6 km.
You: Oh, is not that far, Ok, i think I will walk to school. Bye take care.
Your friend: Ok bye.