25. The mean distance of Earth from the Sun is 149.6 × 10° km and the mean distance of Mercury from the Sun is 57.9 x 106 km. The period of Earth's revolutions is 1 year, what is the period of Mercury's revolution? a. 0.24 year on Earth b. 0.42 year on Earth c. 1.13 year on Earth d. 1.31 year on Earth
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