John and Peter are training for the Olympic Games 100 meters freestyle. They start at opposite ends of a 90 meter pool, and start to swim the length of the pool. When they reach one end, they immediately turn around and continue swimming.

John swims at the competitive rate of 3 meters per second, while Peter swims at the leisurely warmup rate of 2 meters per second. If they swam for 12 minutes, how many times did they pass each other?

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