Multiple choice

A goods train runs 668 meters, 127 meters, 208 meters, 312 meters and 535 meters respectively in the first five minutes, and for the next five minutes maintains an average speed of 36 km per hour. The average speed of the train per hour during this period was

  1. 28.6 km/hr

  2. 31.4 km/hr

  3. 29.1 km/hr

  4. 18.8 km/hr
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total distance in the first 5 minutes is 668 + 127 + 208 + 312 + 535 = 1850 meters (1.85 km). In the next 5 minutes at 36 km/hr, the train travels (36/60) * 5 = 3 km. Total distance = 4.85 km in 10 minutes (1/6 hour). Average speed = 4.85 / (1/6) = 29.1 km/hr.

AI explanation

Use the formula Average Speed = Total Distance / Total Time. The total distance covered in the first five minutes is 668 + 127 + 208 + 312 + 535 = 1850 meters, or 1.85 km. In the next five minutes, the train travels 36 km/hr multiplied by 5/60 hours, which equals 3 km. The total distance over the ten minutes (1/6 of an hour) is 4.85 km, making the average speed 4.85 divided by 1/6, resulting in 29.1 km/hr.

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