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+// Chapter 1 addl_Example 3 
+//==============================================================================
+clc;
+clear;
+
+//input data
+
+v       = 1440;         // velocity of ultrasonics in  sea water in m/s
+t       = 0.33          // time taken b/w tx and rx in sec
+
+//Calculations
+
+d       = v*t;          // distance travelled by ultrasonics
+D       = d/2;          // depth of submerged submarine in m
+
+//output
+mprintf('Depth of submerged submarine = %3.1f m',D);
+
+//==============================================================================