1.

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. Its average speed and the speed in the second half of the journey is

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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. Its average speed and the speed in the second half of the journey is



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