How can I add distance to signals and how can I determine the locations of signals?

please

I have two sources for sending signals, where x1 represents the signal from the first source and x2 represents the signal from the second source :

where :

w1: First Angular Frequncy (rad / sec) and frequncy 40 KHZ.

W2: Second Angular Frequncy (rad / sec) and frequncy 60 KHZ.

n: Number of samples

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I have this code, how can I add the following to it?

1. How can I add the distance to x1 and x2 and find the distance between them ?
2. How can I find location x1 and location x2 ?
3. Plot Magnitude of FFT with frequencies ?

Please rewrite the code correctly to get the above results.

    clear all
    clc
    close all
    
    % Define all the parameters.
    
    % Frequncy for wave one(KHZ).
    f1 = 40e6 ;  
    % Frequncy for wave two(KHZ).
    f2 = 60e6 ;
    
    % The speed of light in vacuum (m/sec).
    c = 3e8 ;
    
    % Wavelength for wave one(m).
    h1 = c / f1 ;
    % Wavelength for wave two(m).
    h2 = c / f2 ;
    
    
    % Imaginary part.
    j=sqrt(-1);
    
    % Initialize the vector to store the values.
    X = zeros(1, 20);
    
    % Make for loop (where n: number of samples).
    for n = 1:20;
        
        x1=exp(j*h1*n);
        x2=exp(j*h2*n);
        X(n) = x1 + x2;
    
    end
    
    % Compute FFT.
    Y = fft(X, 256);
    
    % Compute Magnitude FFT
    Y1 = abs(Y);
    plot( Y1 );
    grid on
    title('Magnitude of FFT Spectrum of X(N)', 'FontSize',12,'Color','k');