A bus travelling the first one third distance at aspeed of 10 km/h - the next one third at 20 km/h and thelast one-third at 60 km/hThe average speed of the busis [1991]

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A bus travelling the first one third distance at aspeed of 10 km/h - the next one third at 20 km/h and thelast one-third at 60 km/hThe average speed of the busis [1991]