Please Help with Physics?

Two guitar strings, of equal length and linear density, are tuned such that the second harmonic of the first string has the same frequency as the third harmonic of the second string. The tension of the first string is 670 N. Calculate the tension of the second string. Answer in units of N. I'm not too sure on... show more Two guitar strings, of equal length and linear density, are tuned such that the second harmonic of the first string has the same frequency as the third harmonic of the second string. The tension of the first string is 670 N. Calculate the tension of the second string. Answer in units of N.

I'm not too sure on how to do this one, please help me out. You'll get Best Answer if it's right.
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