Q:  What is the value of H0 after we simplify in this way?

                         km          1000 m        1 Mpc
          H0  =   500 * -------  *  -------- *  ---------------
                        Mpc * s       1 km      3.1 x 10^(22) m


                                    1
              =   1.6 x 10^(-17)  -----
                                    s