Question 617107
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Hi, 
Keiko bicycles 8km/h faster than Javier. 
Let x and (x+8) represent Javier's and Keiko's speeds respectively
Question states*** Note: D = rt or D/r = t
In the same time it takes Javier to bicycle 30 km, Keiko can bicycle 54 km.
{{{ 30/x = 54/(x+8)}}}  Cross Multiplying to solve
    54x = 30x + 240
      24x = 240
        x = 240/24 =10kmph, Javier's speed.  Keiko's speed is 18kmph