Verified Answer :

Apocrophon

You're trying to find a distance per given time, so by creating a ratio of the first time and setting it equal to an incomplete ratio of the second time, you can solve it easily :)
\(\frac{570~miles}{15~hours}=\frac{x~miles}{7~hours}\)
Cross-multiply the fractions:
\(570*7=15*x\\3990=15x\\x=\frac{3990}{15}=266~miles\)

Twinee

570/15=38

So 38 miles per hour

If the bird was to fly for seven hours at a constant speed the bird would fly 266 miles in 7 hours.

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