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There are 21 poles with a constant distance between each pole. A car takes 30 seconds to reach the 16th pole. How long does it take to reach the last pole?

Correct answer: B. 40 seconds

  • A. 39 seconds
  • B. 40 seconds
  • C. 39.38 seconds
  • D. 39.5 seconds

Explanation

Taking the first pole as the starting point, reaching the 16th pole covers 15 equal intervals, while reaching the 21st pole covers 20 intervals. Therefore the time is 30 s x 20/15 = 40 s. The likely wrong choice is 39 s, which comes from estimating rather than using the ratio of intervals.

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