For a 3 degree glideslope, required rate of descent in feet per minute is approximately equal to ground speed in knots multiplied by 5.
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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 would require approximately 35x3=105 nautical miles.
Golden Rule 1-Aviate. The PF must fly the aircraft (pitch attitude, thrust sideslip, heading) to stabilize the aircraft's pitch attitude, bank angle, vertical flight path and horizontal flight path. The PM must back up the PF (by monitoring and making call outs till aircraft stabilised). Golden Rule 2-Navigate.
The Twelve-Five Standard Security Program (TFSSP) outlines requirements for FAA Part 135 certificated carriers offering commercial air transport using aircraft with a maximum certificated takeoff weight between 12,500 pounds (5,670 kg) and 100,309.3 pounds (45,500 kg).
So, in normal circumstances, the pilots should begin their descent110 NM from the target or the landing aerodrome. The use of trigonometry will always give the most accurate value for the top of descent.
As part of the testing of a new aircraft, the manufacturer must demonstrate that all passengers can be evacuated in a short amount of time when an emergency arises - within 90 seconds to be precise. If it doesn't comply, the aviation authorities won't approve its safety certification.