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A train moves with a constant speed of ...

A train moves with a constant speed of ` 36 km h^(-1)` in the first `10 minutes`, with another constant speed of ` 45km h^(-1)` in the bext ` 10 minnutes` and then with an acceleration of 5 ms^(-2)` in the last `10 minutes. Calculate the average speed of last ` 10 minutes`. Calculate the average speed of the train for this journey and the total distance travelled.

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