A boat covers $24 \text{ km}$ upstream and $36 \text{ km}$ downstream in $6 \text{ hours}$. It covers $36 \text{ km}$ upstream and $24 \text{ km}$ downstream in $6.5 \text{ hours}$. What is the speed of the stream?

Options:

• A: $1 \text{ km/h}$
• B: $2 \text{ km/h}$
• C: $3 \text{ km/h}$
• D: $4 \text{ km/h}$

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