A wave is represented by the equation$y = 7\sin \left( {7\pi t - 0.04\,x\pi + \frac{\pi }{3}} \right)$ $x$ is in metres and $ t$ is in seconds. The speed of the wave is
  • A$175\, m/sec$
  • B$49 \pi\,m/sec$
  • C$\frac{49}{\pi}\,m/sec$
  • D$0.28 \pi\,m/sec$
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