Multiple choice

Mr. David usually starts at 9:00AM and reaches his office just in time, driving at his regular speed. Last Wednesday, he started at 9:30AM and drove 25% faster than his regular speed. Did he reach the office in time? (1) Last Monday, he started to his office 20 minutes early, drove 20% slower than his regular speed, and reached his office just in time. (2) Last Tuesday, he started to his office 10 minutes early, and reached the office 10 minutes early driving at his regular speed.

  1. if statement (1) ALONE is sufficient to answer the question but statement (2) alone is not sufficient;

  2. if statement (2) ALONE is sufficient to answer the question but statement (1) alone is not sufficient.

  3. if the two statements TAKEN TOGETHER are sufficient to answer the question, but NEITHER statement ALONE is sufficient;

  4. if EACH statement ALONE is sufficient to answer the question;

  5. if the two statements TAKEN TOGETHER are still NOT sufficient to answer the question
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A Correct answer
Explanation

Let d be distance, r be regular speed. Time taken = d/r. Statement (1) provides a scenario with a different time and speed that allows solving for the relationship between d and r, which is sufficient to determine if he reached on time in the Wednesday scenario. Statement (2) only provides information about his regular speed behavior, which is insufficient to determine the outcome of the Wednesday scenario.

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