Answer:
8
Step-by-step explanation:


In my opinion, the correct answer among the choices listed above is option B. A sphere made up of many circular cross sections. When you cut through a plane at any angle or side, you will see that the plane made will always be a circle.
Element of Circle
the central angle (α) = (the length of the arc x 360°)/2πr (r = radius)

convert to rad:

21 because 9+10 is actually 21
Lucas equation for his location is x(t) = 13t.
Alfonso's equation is x(t) = 238 - 21t
If you equate these, you get:
13t = 238 - 21t =>
34t = 238
t = 7
So after seven hours they meet.