Answer:
24.08 feet
Explanation:
First Lucy goes from the tire swing to the slide, so the distance travelled is 7.4 feet.
Then, Lucy goes from the slide to the monkey bars, so she travelled 6.7 feet.
Finally, Lucy goes back to the tire swing, and this distance can be calculated using Pythagoras Theorem, as these courses make a triangle with a 90 degrees angle:
X^2 = 6.7^2 + 7.4^2
X^2 = 99.65
X = 9.98 feet
So this last course measures 9.9825 feet.
The total length Lucy travelled is 7.4 + 6.7 + 9.98 = 24.08 feet