So I run into a problem on a test and I am pretty sure i am right
A+B->C+D Fast
D+B->E Slow
K1[A]=K-1[C][D]
[D]=K1/K-1[A]/[C]
K2[D]=E
K2[ K1/K-1[A]/[C]]=E
K [A]/[C]=E
K^2[A]/[C]=E<---my answer
K^2[A]=E<---Test answer
A+B->C+D Fast
D+B->E Slow
K1[A]=K-1[C][D]
[D]=K1/K-1[A]/[C]
K2[D]=E
K2[ K1/K-1[A]/[C]]=E
K [A]/[C]=E
K^2[A]/[C]=E<---my answer
K^2[A]=E<---Test answer