Answer
$v = 1435~m/s$
Work Step by Step
We can find the speed of sound in mercury:
$v = \sqrt{\frac{B}{\rho}}$
$v = \sqrt{\frac{2.8\times 10^{10}~Pa}{1.36\times 10^4~kg/m^3}}$
$v = 1435~m/s$
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