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1.1

A

$$ \begin{align} SpeedUpRatio = k = \frac{150}{100} = 1.5 \\ a = \frac{1500}{2500} = \frac{3}{5} \\ T_{new} = (\frac{3}{5} * \frac{1}{1.5}) + (1 - \frac{3}{5}) = \frac{4}{5} \\ \end{align} $$