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+// Chapter 3 example 3
+//------------------------------------------------------------------------------
+clc;
+clear;
+// Given data
+PW  = 30*10^-6;     // pulse width in sec
+ips = 20*10^-6;     // inter pulse separation
+v   = 3*10^8;       // propagation speed in m/s
+
+// Calculations
+T   = PW+ips+PW+ips+PW      // time duration of the pulse train for having 3 pulses on the line at a time
+l   = v*T;                  // minimum length of cable required
+
+// Output
+mprintf('Minimum length of cable required = %d km',l/1000);
+//------------------------------------------------------------------------------