Average speed of balloon $\"\"$ miles/hour.

$\"\"$ .

Speed = distance/time.

$\"\"$

$\"\"$ ft/sec

After $\"\"$ seconds balloon located at $\"\"$ .

From Pythagorean theorem :

$\"\"$ .

The horizontal distance from the intersection to the balloon is $\"\"$ ft.

The vertical distance from the intersection to the balloon is $\"\"$ ft.

$\"\"$

$\"\"$ ft.