Multiple choice

An express train travels at an average speed of $120$ km per hour, stopping for $4$ minutes after every $80$ kms. How long will it take the train to reach a destination $960$ km away?

  1. $8$ hrs $40$ minutes
  2. $8$ hrs $44$ minutes
  3. $8$ hrs $48$ minutes
  4. $8$ hrs $56$ minutes
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Travel time = 960 / 120 = 8 hours. The train stops every 80 km. Number of stops = (960 / 80) - 1 = 11 stops. Total delay = 11 * 4 minutes = 44 minutes. Total time = 8 hours 44 minutes.

AI explanation

Using the formula Time equals Distance divided by Speed, the pure travel time is 960 divided by 120, which equals 8 hours. The train covers 80 km in each interval, meaning there are 960 divided by 80, or 12 intervals, for a total of 11 stops since the final destination does not have a stop after it. Multiplying 11 stops by 4 minutes gives 44 minutes of stopping time, so the total time is 8 hours and 44 minutes.

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