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A train travels 40 km at a uniform speed of 30kmh−1. Its average speed after travelling another 40 km is 45kmh−1 for the whole journey. Find its speed in the second half of the journey.

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A train travels 40 km at a uniform speed of 30kmh1. Its average speed after travelling another 40 km is 45kmh1 for the whole journey. Find its speed in the second half of the journey.




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