Two satellites \( A \) and \( B \) revolve around the same planet in coplanar circular orbits ly...

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Two satellites \( A \) and \( B \) revolve around the same planet in coplanar circular orbits lying in the same plane. Their periods of revolutions are \( 1 \mathrm{~h} \) and \( 8 \mathrm{~h} \), respectively and the radius of the orbit of \( A \) is \( 10^{4} \mathrm{~km} \). The speed of \( B \) relative to \( A \) (in \( \mathrm{km} / \mathrm{h} \) ) when they are close to each other, will be
(a) \( 3 \pi \times 10^{4} \)
(b) zero
(c) \( 2 \pi \times 10^{4} \)
(d) \( \pi \times 10^{4} \)
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