A runner completes a 10-kilometre race in 50 minutes at a constant pace. What is the average speed?

Answer and explanation

Correct answer: D. 12 kilometres per hour

  1. Step 1: Speed equals distance divided by time in hours. Step 2. 50 minutes is 5/6 of an hour, and 10 divided by 5/6 is 12. Answer: 12 kilometres per hour. Why not the others: 10 would need 60 minutes; 5 would need 120 minutes; 15 would need 40 minutes.

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