Quantitative Aptitude Geometry

Two circles of radii 15 and 18 cm touch each other externally. What is the length (in cm) of the direct common tangent to the two circles?

1
\(18 \sqrt{6}\)
2
\(12 \sqrt{15}\)
3
\(30 \sqrt{6}\)
4
\(6 \sqrt{30}\)

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