A reaction has $E_a=60.0\mathrm{kJ}\mathrm{mo}{\mathrm{l}}^{-1}$ ($R=8.314\mathrm{J}\mathrm{mo}{\mathrm{l}}^{-1}{\mathrm{K}}^{-1}$). The ratio $k(310\mathrm{K})/k(300\mathrm{K})$ is closest to

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