A takes $30 \text{ minutes}$ more than B to cover a distance of $15 \text{ km}$. If A doubles his speed, he takes $1 \text{ hour}$ less than B. Find the original speed of A.
Options:
- A: $4 \text{ km/h}$
- B: $5 \text{ km/h}$
- C: $6 \text{ km/h}$
- D: $7.5 \text{ km/h}$
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