Eight more than 3 times a numbers is 2

we can say 8 + 3x = 2 ; minus 8 from both sides

3x = -6; x = -6/3 = -2.

-2 is answer

Distance = rate*time, or

distance = (average speed)* time, so

average speed = distance/ time.

average speed = 205 mi / (3/12) h = 205 mi/ (1/4)h = 205*4 mi/h=

= 820 mi/h

It is looks to high for speed of the truck,

probably time should be 3.12 h,

then

average speed = 205 mi / (3.12) h ≈ 65.71 mi/h.

That looks close to real life.