Rate/Speed Equation: If a plane can travel 510 mph with the wind...?

Rdy2BeANurse

New member
If a plane can travel 510mph with the wind, and 410 mph against the wind, find the speed of the plane in still air.

Also,
At the beginning of a walk, Roberto and Juanita are 8.8 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 one hour. What are their speeds?
Roberto?
Juanita?
 
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