Two stations A and B are $90 \text{ km}$ apart. Two persons X and Y start at the same time from A and B respectively, and move towards each other at speeds of $20 \text{ km/h}$ and $25 \text{ km/h}$. After they meet, they continue to their opposite destinations, turn back, and meet again. How much time after the start will they meet for the second time?

Options:

• A: $4 \text{ hours}$
• B: $5 \text{ hours}$
• C: $6 \text{ hours}$
• D: $8 \text{ hours}$

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