Engine stopped running at 90mph

What is your question?

My engine stopped running today when going down the highway at 90mph, it gave no warning of any trouble. Temp was normal, full tank of gas, engine didn't sputter or give any signs of stalling. I went to give the car more gas and noticed that the engine had died so, I slowed down to 20mph and attempted a rolling start and it will turn over but will not start... Can someone please help me... Becausevof this problem, my girlfriend and I are stranded in the middle of Wyoming, over 500 miles from home. Wesley