What is Roberto’s speed at mph and what is Juanita’s speed at mph?

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What is Roberto’s speed at mph and what is Juanita’s speed at mph?

At beginning of a walk, Roberto and Juanita are 5.5 miles apart. If they leave at the same time and walk in the same direction, Roberto overtakes Juanita in 11 hours.  If they walk towards each other, they meet in 1 hour.  What are their speeds?