A Chinese patrol ship was spotted 150 kilometers north of a Philippine fishing boat at 6:00 a.m. The patrol ship is sailing south at 45 kilometers per hour, while the fishing boat is sailing east at 30 kilometers per hour, returning to the nearest Philippine island. At 9:00 a.m., how quickly (in kilometers per hour) is the distance between the patrol ship and the fishing boat changing? (Up to two decimal places)

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