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+//chapter 17 Ex4
+clc;
+clear;
+close;
+t=1+(40/60); //time in hours
+//dist=t*s; //distance in km and s is speed
+//remain_dist=24-dist; //remaining distance in km
+//dist=(5/7)*remain_dist;
+
+
+mycoeff=[-72 12];
+p=poly(mycoeff,"x","coeff");
+ans=roots(p); 
+speed=ans*5/18; //converting to m/sec
+printf("The speed is %1.2f m/sec",speed);