Answer :
To cook an egg in boiling water to the same hardness at the top of a mountain, we should cook the egg for a shorter time.
We are cooking the egg at a mountain which is at a very high altitude then where we normally live.
Because of the high altitude of the Mountain the atmosphere gets very thin.
And because of the thin atmosphere the pressure on the egg will be less than the usual pressure.
As we know that during cooking there will be less pressure on the egg so it will boil at a much faster rate.
Now, in order to cook the egg to the same hardness, we should change our normal cooking procedure in such a way that the egg is boiled to the same hardness.
So, we will cook the egg for a shorter period of time then the usual time.
To know more about pressure at high altitude, visit,
https://brainly.com/question/355620
#SPJ4