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    In Java 15

    public static String kangaroo(int x1, int v1, int x2, int v2) {

     //x1 + v1*f = x2 + v2*f
     //(x1-x2)+(v1-v2)*f = 0
    
        String result = "";
        double f = (double) (x2-x1)/(v1-v2);
    
        if(f < 0 || (f*10)%10 != 0){
           result = "NO"; 
        } else {
            result = "YES";
        }
        return result;
    }