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+clear
+//Given
+l1=15*10**-10 //m
+l=6563*10**-10
+c=3*10**8 //m/s
+
+//Calculation
+v=(c*l1)/l
+
+//Result
+printf("\n Speed of star is %0.2f *10**5 m/s",v*10**-5)