Help with sed/substitution!

I have file.txt

    1              4              7              9              3
  

I want to replace the tabs with a space, but my code doesn't work.

cat file.txt | sed 's/"\t"/ /g' > t.txt

But file is still the same. Numbers seperated by tabs instead of spaces.

Help?

[code]
# sed 's/\t/ /g' file.txt > t.txt

[code]

Try this.. may help u

cat file.txt | tr -s '\t' ' ' > t.txt