Assuming that a Boeing 737-300 has a glide ratio of 17:1 then if at 30,000 AGL it can glide about 96 miles under perfect conditions. The average Cessna 150 I was flying had a glide ratio of about 7:1.
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Maximum and minimum glideslope angles are 3.25 degrees and 2.5 degrees respectively.
Without engine thrust, the 747 had a glide ratio of 15:1, meaning it can glide forward 15 kilometres for every kilometre it drops. After calculating the glide ratio, the crew realized that they had less than 30 minutes to regain power before they smashed into the ground.
With it's efficient wings the glide ratio of the B 777 should be around 15:1. Extrapolating, from a Flight Level of 390 gives us a theoretical gliding distance of about 110 Miles.
The largest open-class glider, the Eta, has a span of 30.9 meters and has a glide ratio over 70:1. Compare this to the Gimli Glider, a Boeing 767 which ran out of fuel mid-flight and was found to have a glide ratio of 12:1, or to the Space Shuttle with a glide ratio of 4.5:1.
The key measure of performance in gliding is the glide ratio which is related to the lift-to-drag ratio of the aircraft. The glide ratio of a clean A320 is 17:1 which means it can travel 17 units of distance forwards for every 1 unit of distance downward at best glide speed.
Without engine thrust, the 747 had a glide ratio of 15:1, meaning it can glide forward 15 kilometres for every kilometre it drops. After calculating the glide ratio, the crew realized that they had less than 30 minutes to regain power before they smashed into the ground.
The A380 has a glide ratio of about 15:1, which means that for every 15 kilometers (9 miles) it travels horizontally, it loses 1 kilometer (0.6 miles) of altitude. Therefore, if an A380 is cruising at 12 kilometers (7 miles) above sea level, it can glide for about 180 kilometers (110 miles) before reaching the ground.
Assuming that a Boeing 737-300 has a glide ratio of 17:1 then if at 30,000 AGL it can glide about 96 miles under perfect conditions. The average Cessna 150 I was flying had a glide ratio of about 7:1. Airliners are far “cleaner” and don't have a big windmilling prop.
So to your original question, a person who has a current type rated for required pilot flight crewmember duties on a Boeing 747 cannot perform the same duties on a Boeing 787, 737, etc. without being type rated on those aircraft as well.
Without engine thrust, a 747-200 has a glide ratio of roughly 15:1, meaning it can glide forward 15 kilometres for every kilometre it drops. The flight crew quickly determined that the aircraft was capable of gliding for 23 minutes and covering 91 nautical miles (169 km) from its flight level of 37,000 feet (11,000 m).