The ratio of rates of diffusion of gases $X$ and $Y$ is $1:5$ and that of $Y$ and $Z$ is $1:6$. The ratio of rates of diffusion of $Z$ and $X$ is

  • A
    $1:30$
  • B
    $1:6$
  • C
    $30:1$
  • D
    $6:1$

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