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  3. Planet "Y" orbits the Sun in six months. AB is four times the distance of CD and

Planet "Y" orbits the Sun in six months. AB is four times the distance of CD and

游客2023-10-16  28
问题 Planet "Y" orbits the Sun in six months. AB is four times the distance of CD and moreover it turns out that planet X travels at haft the speed of planet Y. How long does Planet "X" take to orbit the Sun?
选项 A、8 years.
B、6 years.
C、4 years.
D、2 years.
答案 C
解析 由题意可知AB=4CD，故x绕太阳一周的距离为Y的4倍，又planet X travels at half the speed of planet Y，故x绕太阳一周的时间为Y的8倍。Planet Y绕太阳一周的时间为6个月，故planet X绕太阳一周需4年。
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