A large open tank has two holes in the wall. One is a square hole of side $L$ at a depth $y$ from the top and the other is a circular hole of radius $R$ at a depth $4y$ from the top. When the tank is completely filled with water, the quantities of water flowing out per second from both holes are the same. Then, $R$ is equal to

  • A

    $\frac{L}{{2\sqrt \pi  }}$

  • B

    $2\pi L$

  • C

    $L$

  • D

    $\frac{L}{{\sqrt {2\pi } }}$

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