Rani covers a certain distance by car driving at 5 km/h and returns the starting point riding on a scooter at 2 km/h. Find her average speed for the whole journey.
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Answer:
20/7 km/h
Explanation:
According to the formula,
Average speed = 2AB/A+B
Here, A = 5 km/h, and B = 2 km/h
Therefore, Required average speed = 2×5×2/7=20/7
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