A source of sound is travelling towards a stationary observer. The frequency of sound heard by the observer is of three times the original frequency. The velocity of sound is $v\, m/sec.$ The speed of source will be
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$n' = n\,\left( {\frac{v}{{v - {v_S}}}} \right)$
$\Rightarrow \frac{{n'}}{n} = \frac{v}{{v - {v_S}}} $
$\Rightarrow \frac{v}{{v - {v_S}}} = 3$
$\Rightarrow {v_s} = \frac{{2v}}{3}$
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