On Sunday, December 10, 2017 at 3:27:33 PM UTC-6, Charlie M. (UH & 002
Yeah, speed is a bit high for a glider going for max L/D.
Could be doable in a real motorglider, depending on height AGL.

Uh, 35 miles, 12 minutes, 175 MPH. Only "motorglider" I can think of that could come close to that is the Arcus Jet.