What is the answer and explain how did you get it

First, we're looking for the length of hypotenuse of right triangle, use pythagorean theorem. We'll get the square of hypotenuse by adding the square of perpendicular sides. See image attached.
h² = 3² + 4²
h² = 9 + 16
h² = 25
h = √25
h = 5

The hypotenuse is 5 meters

Second, count the total distance
d = bryce to warren + warren to mark + mark to bryce
d = 4 + 5 + 3
d = 12

The paper airplane has traveled 12 meters

Assuming you want to know the volume,

volume = 2210.6 in³

Step-by-step explanation:

radius = diameter/2 = 8/2 = 4 in

area of base = πr² = (3.14)(4²) = 50.24 in²

volume of tube portion = base area x height = 50.24 x 40 = 2009.6 in³

cone volume = 1/3bh = 1/3(50.24)(12) = 200.96 in³

total volume = 2009.6 + 200.96 = 2210.56 in³