Two buses $A$ and $B$ are moving in opposite directions. If the first bus $A$ moves towards the east with a speed of $36 \ km/h$ and bus $B$ moves towards the west with a speed of $18 \ km/h$, then the bus $B$ appears to bus $A$ as:
- Amoving with a speed of $5 \ m/s$ from east to west
- Bmoving with a speed of $15 \ m/s$ from west to east
- Cmoving with a speed of $15 \ m/s$ from east to west
- Dmoving with a speed of $10 \ m/s$ from east to west
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