Math mini-contest problem for Day 12 on D.Buzz 😎
@jancharlest is running on a mountain. He can run downhill with an average speed of 15 kilometers per hour (kph) and 9 kph uphill. What will be his average running speed on flat ground?
Math mini-contest problem for Day 12 on D.Buzz 😎
4 years ago
inDBuzz
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