Anu can complete a work in $10$ days. Manu is $25\%$ more efficient than Anu,and Sonu is $60\%$ more efficient than Manu. Working together,how long would they take to finish the job? (in days)

  • A
    $3 \frac{5}{8}$
  • B
    $5 \frac{6}{7}$
  • C
    $2 \frac{6}{17}$
  • D
    None of these

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