<PRE><B>Question 122563</B>
Let x = length of trail


The sum of the first day + second day + third day = Total Trip = x

(1/3)x + (1/3)x +2.4 + 5.6 =x


(2/3)x + 8 = x


Multiply both sides by 3:
2x + 24 = 3x


Subtract 2x from each side:
24 = 3x-2x
24 km =x


R^2</PRE>