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Two planets orbit in circular orbits around a star have speeds of 5v(planet A) and 2v(planet...

Two planets orbit in circular orbits around a star have speeds of 5v(planet A) and 2v(planet B). Express your answers in fractional form, simplified as much as possible.

What is the ratio of the orbital radii of the planets?

rB/rA = ___/___

What is the ratio of their periods? PB/PA = ___/____

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