PSC Tips

Time and Work Problems – Shortcut Tricks and Formulas

Time and Work Formulas for PSC Exams

  1. A can finish work in X days.
    B can finish work in Y days.
    Both can finish in Z days = (X*Y) / (X+Y).
  2. Both A and B together can do work in T days.
    A can do this work in X days.
    then, B can do it in Y days = (X*T) / (X-T)
  3. A can finish work in X days.
    B can finish work in Y days.
    C can finish work in Z days.
    Together they can do work in T days = (X*Y*Z)/ [(X*Y)+(Y*Z)+(X*Z)]
  4. A can finish work in X days.
    B can finish work in Y days.
    A*X = B*Y
    Y = (A*X) / B
  5. A can finish work in X days.
    B can finish work in Y days.
    A left work after P days then B need to work Q days
    Q = [(X – P) / X ] * Y
  6. M1 person can do W1 work in D1 days and H1 hours
    M2 person can do W2 work in D2 days and H2 hours
    M1D1H1 = M2D2H2
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