A sar travels first \( 30 \mathrm{~km} \) with a uniform speed of \...

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A sar travels first \( 30 \mathrm{~km} \) with a uniform speed of \( 60 \mathrm{~km} \mathrm{~h}^{-1} \) and then next \( 30 \mathrm{~km} \) with a uniform speed of 40 \( \mathrm{km} h^{-1} \). Calculate : (i) the total time of journey, (ii) the average speed of the car.
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