Drive Time from Silver Spring to Berryville Va/Summit Point

[OwnedbyDuncan]

Have a friend coming down the end of this month for The Belgian Terv National. Herding trial is in Berryville. She will be coming from Silver Spring.
On a Saturday morning at a reasonable pace since she will be towing a camping trailer how long should it take for her to get ot Berryville, VA approx 1 mile from the turn off for Summit Point from Rt 7. Is it quicker to go Rt340 or Rt81?

TIA

Dave Apker and the collies.

[1996 328ti]

Have a friend coming down the end of this month for The Belgian Terv National. Herding trial is in Berryville. She will be coming from Silver Spring.
On a Saturday morning at a reasonable pace since she will be towing a camping trailer how long should it take for her to get ot Berryville, VA approx 1 mile from the turn off for Summit Point from Rt 7. Is it quicker to go Rt340 or Rt81?

I can make Charles Town from Silver Spring (without traffic) in probably an hour. I take 270-70-340.