Two satellites orbiting the Earth stay a fixed $100\,\text{km}$ apart. Satellite X sends a microwave pulse to satellite Y. The pulse needs time $T$ to arrive at Y. Satellite Y then sends a pulse of visible light back to satellite X. How long does the light pulse take to reach X?
- A$10^{-5}T$
- B$10^{-3}T$
- C$10^{-2}T$
- D$T$