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A tank is filled with water up to a height $H$. Water is allowed to come out of a hole $ P$  in one of the walls at a depth $ D $ below the surface of water. Express the horizontal distance $x$  in terms of $ H $ and $D$ 
  • A$x = \sqrt {D(H - D)} $
  • B$x = \sqrt {\frac{{D(H - D)}}{2}} $
  • C$x = 2\sqrt {D(H - D)} $
  • D$x = 4\sqrt {D(H - D)} $
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