Multiple choice

A train travels 10 km in the first quarter of an hour, 16 km in the second quarter and 40 km in the third quarter. Find the average speed of the train per hour over the entire journey?

  1. $60 km/h$
  2. $88 km/h$
  3. $75 km/h$
  4. $77 km/h$
  5. $79 km/h$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Total distance = 10 + 16 + 40 = 66 km. Total time = 3 quarters of an hour = 3/4 hour = 45 minutes. Average speed = Total distance ÷ Total time = 66 ÷ (3/4) = 66 × 4/3 = 22 × 4 = 88 km/h (option B).

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