1 . The ages of A and B are in the ratio 3:1 . Fifteen years hence , the ratio will be 2:1 . Their present ages are :

• A. 30 years , 10 years
• B. 45 years , 15 years
• C. 21 years , 7 years
• D. 60 years , 20 years

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Answer: Option B

Explanation: