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+//chapter 17 Ex6
+
+clc;
+clear;
+close;
+s1=25;s2=4;    //given speeds in km/hr
+function [s]=average(s1,s2)
+    s=(2*s1*s2)/(s1+s2);
+endfunction
+
+s=average(25,4);
+t=5+(48/60);   //converting minutes into hours
+d=t*s;         //distance=time*speed
+dpost=d/2;
+printf("The distance of post office from village is %2.0f km",dpost);