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Omni-MATH / At what constant speed should Nate drive to arrive just in time if he drives at…

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problem

At what constant speed should Nate drive to arrive just in time if he drives at a constant speed of $40 \mathrm{~km} / \mathrm{h}$ and arrives 1 hour late, and at $60 \mathrm{~km} / \mathrm{h}$ and arrives 1 hour early?
Plain-text mathematical notation (without MathML)
At what constant speed should Nate drive to arrive just in time if he drives at a constant speed of $40 \mathrm{~km} / \mathrm{h}$ and arrives 1 hour late, and at $60 \mathrm{~km} / \mathrm{h}$ and arrives 1 hour early?
Original LaTeX notation
At what constant speed should Nate drive to arrive just in time if he drives at a constant speed of $40 \mathrm{~km} / \mathrm{h}$ and arrives 1 hour late, and at $60 \mathrm{~km} / \mathrm{h}$ and arrives 1 hour early?

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