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+clc

+clear

+//Input data 

+x1=10;//The thickness of the ice layer on the surface of a pond in cm 

+x=5;//The increase in the thickness of the ice when the temperature is maintained at -10 degree centigrade in cm 

+x2=x1+(x);//The increased thickness of the ice layer on the surface of a pond in cm 

+T=-10;//The temperature of the surrounding air in degree centigrade 

+d=0.90;//The density of ice at 0 degree centigrade in g/cm^3 

+L=80;//The latent heat of ice in cal/g 

+K=0.005;//The thermal conductivity of ice  

+

+//Calculations 

+t=((d*L)/(2*K*(-T)))*(x2^2-x1^2);//The time taken to increase its thickness by 5 cm in sec 

+t1=t/(60*60);//The time taken to increase its thickness by 5 cm in hours

+

+//Output

+printf('The time taken to increase its thickness by 5 cm is t = %3.0g s (or) %3.0f hours',t,t1)