Respuesta :

ltrevill
So we are just solving for R?

     d = rt
   d/t = rt/t
   d/t = r

Simply isolate the r to one side, using the principle "what you do to one side, you must do to the other." 
 
ANSWER: r = d/t 
                       ( d divided by t)

Hope this helps!! God bless! :)