And while we're at it, how far would a 777 glide if (worst case scenario) a power failure shut down all electronics and all engines at the altitude of 35000 ft and airspeed of 470 knots?
The possible glide distance would be approximately 20 times the altitude, hence about 20*6 = 120 miles but not at that speed, to achieve this maximum glide distance pilots would have to lower the speed.