In rectangle $ABCD$, points $F$ and $G$ lie on $\overline{AB}$ so that $AF = FG = GB$ and $E$ is the midpoint of $\overline{DC}$. Also, $\overline{AC}$ intersects $\overline{EF}$ at $H$ and $\overline{EG}$ at $J$. The area of rectangle $ABCD$ is 70. Find the area of triangle $EHJ$.

[asy]
pair A,B,C,D,I,F,G,H,J;
A=(0,0);
B=(9,0);
C=(9,5);
D=(0,5);
F=(3,0);
G=(6,0);
I=(4.5,5);
H=(3.5,1.67);
J=(5,3.33);
draw(A--B--C--D--cycle);
draw(A--C);
draw(F--I--G);
label("$A$",A,W);
label("$B$",B,E);
label("$C$",C,E);
label("$D$",D,W);
label("$E$",I,N);
label("$F$",F,S);
label("$G$",G,S);
label("$H$",H,NW);
label("$J$",J,NE);
[/asy]
The area of triangle $EFG$ is $(1/6)(70)=35/3$. Triangles $AFH$ and $CEH$ are similar, so $3/2 = EC/AF=EH/HF$ and $EH/EF=3/5$. Triangles $AGJ$ and $CEJ$ are similar, so $3/4=EC/AG=EJ/JG$ and $EJ/EG=3/7$. [asy]
pair A,B,C,D,EE,I,F,G,H,J;
A=(0,0);
B=(9,0);
C=(9,5);
D=(0,5);
EE = (C + D)/2;
F=(3,0);
G=(6,0);
I=(4.5,5);
H = extension(A, C, EE, F);
J = extension(A, C, EE, G);
draw(A--B--C--D--cycle);
draw(A--C);
draw(F--I--G);
label("$A$",A,W);
label("$B$",B,E);
label("$C$",C,E);
label("$D$",D,W);
label("$E$",I,N);
label("$F$",F,S);
label("$G$",G,S);
label("$H$",H,NW);
label("$J$",J,dir(70));
draw(H--G,dashed);
[/asy] Since the areas of the triangles that have a common altitude are proportional to their bases, the ratio of the area of $\triangle
EHJ$ to the area of $\triangle EHG$ is 3/7, and the ratio of the area of $\triangle EHG$ to that of $\triangle EFG$ is 3/5. Therefore, the ratio of the area of $\triangle EHJ$ to the area of $\triangle EFG$ is $(3/5)(3/7)= 9/35$. Thus, the area of $\triangle
EHJ$ is $(9/35)(35/3)=3$.