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4081894 ft.
For everyone asking for tips to get 3m this is what you need: Golden Gun, tank, and about 30 nukes. You certainly don't need rocket, and the chest bomb is only for insurance.
What you need to do is this, shoot out of tank and then start juggling yourself with the nukes save your golden gun ammo. When you start to slow down after maybe the fifth or sixth nuke, shoot yourself and you will be back to flying at full speed. By the time you are out of ammo and/or nukes you should be at 3m or close to it.