Ice starts forming in lake with water at `0^(@)C` and when the atmospheric temperature is `-10^(@)C`. If the time taken for `1 cm` of ice be `7` hours. Find the time taken for the thickness of ice to change from `1 cm` to `2 cm`

Ice starts forming on a lake with water at 0^(@)C , when the atmospheric temperature is -6^(@)C . If the time taken for 1 cm of Ice to be formed is 5 hours, then time taken for thickness of ice to change from 1 cm to 2 cm is

Ice starts freezing in a lake with water at 0^(0)C when the atmospheric temperature is -10^(0)C . If the time taken for 1 cm of ice to be formed is 12 minute, the time taken for the thickness of the ice to change from 1 cm to 2 cm will be

Ice starts forming in a lake with water at 0^(@)C when the atmosphere temperature is -10^(@)C .If the time taken for first 1cm of ice be formed is 12 minute; the time taken for the thickness of the ice to change from 1cm to 2cm will be: