Two capillary of length $L $ and $2L$  and of radius $R$  and $2R$  are connected in series. The net rate of flow of fluid through them will be (given rate of the flow through single capillary, $X = \pi P{R^4}/8\eta L)$
  • A$\frac{8}{9}X$
  • B$\frac{9}{8}X$
  • C$\frac{5}{7}X$
  • D$\frac{7}{5}X$
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