I have worked on this all day

[Guest]

A plane flies 720 miles against a steady 30m/h headwind and then returns to the same point with the wind. If the entire trip takes 10 hours what is the planes speed in still air?

 

[stapel]

against:
distance: 720
rate: p - 30
time: 720/(p - 30)

with:
distance: 720
rate: p + 30
time: 720/(p + 30)

720/(p - 30) + 720/(p + 30) = 10

Solve.

Eliz.

 

[Guest]

Eliz,
Thank you so much, I was close. But I was still wrong.
Thanks again.
Marilyn