Two long straight roads, one running East-West, and the other running North-South meet at a point O. At 12:00noon, bicycler Bob is on the E-W road at a point 100 kilometers East of O, while runner Renee is at point O. At this time Bob starts riding towards point O and Renee starts running North. Bob bikes at a constant rate of 30 kilometers/hour and Renee runs at a constant rate of 15 kilometers per hour. How fast is the distance between them changing at 2:00pm? Input the number only (no units).

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