Physics
It takes much longer to cook food in the hills than in the plains, because

in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking
due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boil
n the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time
in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere

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Physics
Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open

at the top of Mt. Everest
in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level
at a place in a valley below sea level
at sea level

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