A boat running upstream takes $8$ hours $48$ minutes to cover a certain distance, while it takes $4$ hours to cover the same distance running downstream. What is the ratio between the speed of the boat in still water and the speed of the current?
Options:
- A: $8 : 3$
- B: $5 : 2$
- C: $7 : 3$
- D: $9 : 4$
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