Question: Problem with units in solve

I have a problem when using units in a solve

restart;
Following is from the assignment
Q := 20*Unit('m')^3/Unit('s');

I__e := 0.2e-1;

B := 2*Unit('m');

k := 0.3e-2*Unit('m');

g := 9.82*Unit('m')/Unit('s')^2;

Mannings number
M := 8.1*g^(1/2)/k^(1/6);
A := y*B;


R := y*B/(B+2*y);


V := M*R^(2/3)*sqrt(I__e);
y__0 := solve(Q = V*A, y);
=
/ (5/3)\// /
\0.002644870772 Units:-Unit('m') / \RootOf\
(8/3) 3 (5/3)
-625 Units:-Unit('m') + 5000000 _Z Units:-Unit('m')

5 \ \
+ 1890451531 _Z Units:-Unit('m')/^2/

 

Hope you can use this.. It's the first time I ask a question on this site...

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