It is required to design a circular pipe such that water flowing through it at a speed of $7 \ m/min$ fills a tank of capacity $440 \ m^3$ in $10 \ min$. The inner radius of the pipe should be (in $m$):

  • A
    $2$
  • B
    $\sqrt{2}$
  • C
    $\frac{1}{2}$
  • D
    $\frac{1}{\sqrt{2}}$

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