MathGroup Archive 1997

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Joining matrices

i have to join 2 or more matrices line by line
for example : joinmat[{{{1,2},{3,4}},{{10,20},{30,40}}}] 
                 --> {{1,2,10,20},{3,4,30,40}}

i have tried Transpose [Flatten[Transpose /@ ListOfMatrices,1]]
but it seems rather slow

can anyone help me with a faster solution ?

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