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Cooking done faster at higher temperature than at lower temperature.
On hill tops the air pressure is lower than in the plain.  So water boils at lower temperature than at the plains.  Then  the water in the vessels with the food boils at lower temperature and the food has to cook at lower boiling point of water.

so it takes longer.

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When the surrounding temperature is higher then cooking is done quickly.when the surrounding temperate is lower is takes long time. in plains the temperature is higher than in hills so cooking is done faster and effective in plains than hills.