Drone X and Drone Y raced from the same depot to deliver packages to a rooftop pad. Both launched at 10:00 and did not change their speed throughout the flight. Drone X flew at a constant speed of 72 km/h. When it reached the rooftop at 10:15, Drone Y was 3 km from the rooftop. What was Drone Y's speed?
Opening the drawing…
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