A runner has to cover a distance of 100 km. After running for 5 hours and 20 minutes, he finds that he has completed 2/3rd of the total distance. What is his speed in km/h?

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Accepted Answer

1. Distance covered = 2/3 of 100 = $\frac{2}{3}	imes100=\frac{200}{3}\,$ km.
2. Time = 5 hours 20 minutes = $5\frac{1}{3}=\frac{16}{3}\,$ hours.
3. Speed = distance ÷ time = $\dfrac{200/3}{16/3}=\dfrac{200}{16}=12.5\,$ km/h.
4. So the correct choice is (a).

FINAL_ANSWER: <a>

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