Every morning Zoya cycles from her hostel to college at 16 km/h, and in the evening she rides back by the same route at 24 km/h. What is her average speed for the day's two rides, in km/h?

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Accepted Answer

19.2. For equal distances, average speed = 2 × 16 × 24 ÷ (16 + 24) = 768 ÷ 40 = 19.2 km/h (not the simple mean 20).

Every morning Zoya cycles from her hostel to college at 16 km/h, and in the evening she rides back by the same route at 24 km/h. What is her average speed for the day's two rides, in km/h?

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