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30. The planet Mars has two moons, Deimos and Phobos. Deimos orbits Mars every 1.26 days with an average radius of 2.35 x 103 km. Phobos has an average orbit about four times greater in radius thanDeimos. How long does it take for Phobos to make an orbit of Mars?
a. 2.24 days
b. 5.04 days
c. 9.40 days
d. 10.0 day