Time and Work Shortcuts, Formulas, Video

Time and Work Questions - Page 2
Time and Work Video Lectures - Page 3

Shortcut and Formula on Time and Work

• Work from Days:
  If A can do a piece of work in n days, then A's 1 day's work = $\frac{1}{n}$

• Days from Work:
  If A's 1 day's work = $\frac{1}{n}$, then A can finish the work in n days.

• 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.

• If A is 'x' times as good a workman as B, then he will take of the time by B to do the same work.

• A and B can do a piece of work in 'a' days and 'b' days respectively, then working together, they will take $\frac{xy}{x+y}$ days to finish the work and in one day, they will finish $\frac{xy}{x+y}th$ part of work.