"We"/"Our".
[Edited: I have updated and corrected my calculation, I got it wrong the first time]
Assuming you are married filing jointly, you have a $27,700 standard deduction, and the 12% tax bracket stops at $89,000. That means that the first $116,000 of your income has a zero percent capital gains rate. With income of $40,000 and capital gains of $125,000 (total income of $165,000), that means that the capital gains tax on the land will be 15% of (165k minus 116k = $49,000) or $7350. Then there is the regular income tax (10% and 12%) on $13,000 of regular income (between the standard deduction of 27K and your income of 40K). So about $1300 of regular income tax and $7350 of long term capital gains tax.
Of course, that's a very crude estimate, and assumes facts that are not proven. The online calculators will give you a better estimate if you give them better details.
And of course, you may be able to reduce your gain by taking into account any real estate commission and some (but not all) closing costs. See publication 523 on page 8.
https://www.irs.gov/forms-pubs/about-publication-523
