A firecracker exploding on the surface of a lake is heard as two sounds a time interval $t$ apart by a man on a boat close to water surface. Sound travels with a speed $u$ in water and a speed $v$ in air. The distance from the exploding firecracker to the boat is
  • A$\frac{{uvt}}{{u + v}}$
  • B$\frac{{t(u + v)}}{{uv}}$
  • C$\frac{{t(u - v)}}{{uv}}$
  • D$\frac{{uvt}}{{u - v}}$
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