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CAT 2025 Set-3 | Quantitative Aptitude | Question: 8

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Rahul starts on his journey at $5$ pm at a constant speed so that he reaches his destination at $11$ pm the same day. However, on his way, he stops for $20$ minutes, and after that, increases his speed by $3$ km per hour to reach on time. If he had stopped for $10$ minutes more, he would have had to increase his speed by $5$ km per hour to reach on time. His initial speed, in km per hour, was

  1. $12$
  2. $20$
  3. $18$
  4. $15$

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