Question 1125844
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1.  The condition says that Bugs bunny run 9 times as fast as Elmer Fud:


    x = 9y,                         (1)


    where x is the Bugs bunny' speed and y is the Elmer Fud' speed.



2.  The condition also says that  


    x - y = 15  miles per hour.     (2)



3.  From (1)  and  (2) you have


    9y - y = 15,   or

    8y = 15,   which gives you the solution

    y = {{{15/8}}}  miles per hour  is the Elmer Fud' speed.


4.  Then  x = 9y = {{{(15*9)/8}}} = {{{135/8}}} miles per hour is the Bugs bunny' speed.



<U>Answer</U>.  The Elmer Fud' speed is  {{{15/8}}}  miles per hour.
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Solved.