A train travels the first 15 km at a uniform speed of 30 km/h;
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A train travels the first 15 km at a uniform speed of 30 km/h;

A train travels the first 15 km at a uniform speed of 30 km/h;
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A train travels the first 15 km at a uniform speed of 30 km/h; the next 75 km at a uniform speed of 50 km/h; and the last 10 km at a uniform speed of 20 km/h. Calculate the average speed for the entire train journey.
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