Q:  What is the value of the slope on this graph?  Convert your
            answer to have units of (km/sec) per Mpc.

                         1500 km/sec
           slope  =   ----------------   =   75  km/sec/Mpc
                          20 Mpc


  Q:  How does this value compare to the one based on Hubble's data?

 
            The recent version (75 km/sec/Mpc) is roughly one-seventh
                   of the earlier value (500 km/sec/Mpc).