Answer
$ c= 173m/s$
Work Step by Step
We have the gas constant of R-134a is
$ R = 0.08149 KJ/(KG.K)$
Specific heat ratio at room temparature is
$K =1.108$
We know $c = \sqrt(KRT)$
substituting given values in the equation, we get
$c = \sqrt(1.108 KJ/(KG.K) \times 0.08149 KJ/(KG.K) \times (60 +273)K \times ((1000m^2/s^2)/(1KJ/Kg)))$
$ c= 173m/s$
