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About Rule of three
In aviation, the rule of three or "3:1 rule of descent" is a rule of thumb that 3 nautical miles (5.6 km) of travel should be allowed for every 1,000 feet (300 m) of descent. For example, a descent from flight level 350 to sea level would require approximately 35x3=105 nautical miles. This would have to be adjusted for headwind or tailwind, and also to allow for deceleration time.
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