Answer :
Given:
Distance is 1 mile
Time is 10 second
To find speed,
[tex]\begin{gathered} \text{Speed}=\frac{Distance}{\text{time}} \\ =\frac{1}{10} \\ =0.1\text{ mile/second} \\ =0.1\times3600\text{ mile/hour} \\ =360\text{ mile/hour} \end{gathered}[/tex]With the same speed, the aim is now to find the distance covered in 3 hours.
[tex]\begin{gathered} \text{Distance}=Speed\times\text{time} \\ =360\times3 \\ =1080\text{ miles} \end{gathered}[/tex]Answer: Airplane will cover 1080 miles in 3 hours with the speed of 360 miles/hours