How much will biking, running and weight lifting help me with distance swimming?

Question

Im 16 and I am on my highschool swim team. I currently have a 6:15 in the 500 free.

Answer 1

While cross training is good your time will improve by honing your technique and strategy (pool swim), i.e., timing when you sprint--last 50, 100 in your event.  Also, mixing up the workout by including sprint sets will help you push your speed envelope.

Answer 2

yes but most important is technique and when my older sister was 10 she was faster than you