A and B left simultaneously from pt P to pt Q. A covers each kilometer 2 minutes faster than B. After travelling 18 Km, A returns to point P, waits for 66 minutes and starts to Q decreasing the speed by 20%. Both A and B reach Q simultaneously. If A had travelled from P to Q directly without any stops and return journey, he would have reached Q in 30 minutes. Find the distance between P and Q.

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