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A train covers the first half of 80 km at a speed of 30 km/h and the second half at x km/hr. Calculate x if the average speed of the train is 45 km/h.

Answer» A train covers the first half of 80 km at a speed of 30 km/h and the second half at x km/hr. Calculate x if the average speed of the train is 45 km/h.


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