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A man rides his bicycle 10 km at an average speed of 12 km/hr and again travels 12 km at an average speed of 10 km/hr. What is his average speed for the entire trip approximately?

Correct answer: D. 10.8 kmph

  • A. 11.2 kmph
  • B. 10 kmph
  • C. 10.2 kmph
  • D. 10.8 kmph

Explanation

Total distance is 10 km + 12 km = 22 km, while total time is 10/12 h + 12/10 h = 61/30 h. Therefore average speed is 22 km ÷ (61/30 h) = 660/61 km/h, approximately 10.8 km/h; 11.2 km/h is likely obtained by taking an inappropriate average of 12 km/h and 10 km/h.

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