Can I play music from a iphone dock through and aux cable and android?

I know this sounds stupid but I have a fm transmitter and it has a 30 pin port on it. All my music is on my android and am wondering if I plugged in my friends iphone could I then put a two wau aux cable from his phone to mine and play my music? I know this os unliekly and seems stupid but I'm curious.

If you have 3.5mm jack

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