Two reconnaissance drones depart from the same airbase at the same time, flying in opposite directions along a straight line. Drone Alpha flies at a constant speed of 180 km/h. Drone Bravo flies at a constant speed of 220 km/h. How long will it take for the drones to be 1000 km apart?
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A
2.0 hours
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B
2.5 hours
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C
3.0 hours
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D
4.0 hours