Linking equivalent airspeed with waypoints, altitude, time and speed Say I want to find out EAS and I'm given a time that a pilot will reach a waypoint that is "X" Nautical Miles away, an altitude &amp; I'm also given a ground speed that is increased by a tailwind. Is it possible to derive equivalent airspeed from these factors.

My current state of research is as follows:
I know the traditional EAS equation is useless in this case as I dont know the air density and other equations I've looked at require the Mach number which I also can't obtain. Basically all the EAS equations I've found require a density or the Mach number and I'm not sure how to proceed.
No, it is not possible to derive EAS from the data provided.  




  p=Actual density
  
  p(o) = standard Sea Level Density
  
  TAS = True Airspeed.


You can get to actual density from the pressure altitude and temperature (ISA+ or raw).  Without temperature, it is impossible to derive air density from pressure altitude; only estimates are possible.  For a more in depth derivation, this is a good source.