1.50c + 2.50a = 1100
c + a = 500
multiply the second equation by -1.50
1.50c + 2.50a = 1100
-1.50c - 1.50a = -7.50
The 4 in and the 6 in are the same but the difference between the two triangles are 1.5
6:4 = 1.5
So if 12 = 1.5 (?)
The (?) = 8
If it takes Tim 2 hours to drive to the campground and it takes 3 times more long then driving to the campground. Then all you have to do is 3 multiplied by 2 and then your answer would be 6 hours.
Hope it helps!