Question

Jake and Amanda drove for 9 hours against a wind speed of 8 mph. Traveling with the same wind speed, it took them 7 hours to make the return trip. How fast were they traveling in still air?

Answer 1

This can be answered with a proportion.
\[\frac{ 8 }{ 9 } = \frac{x}{7}\]
Then cross multiply.
9x=56
\[\frac{56}{9} = 6\frac{2}{9}\]