Time and Work - Important Formulae

  1. Work from Days:
    If A can do a piece of work in n days, then A's 1 day's work =1.
    n
  2. Days from Work:
    If A's 1 day's work =1,then A can finish the work in n days.
    n
  3. Ratio:
    If A is thrice as good a workman as B, then:
    Ratio of work done by A and B = 3 : 1.
    Ratio of times taken by A and B to finish a work = 1 : 3.
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