If A can do a piece of work in n days, then A’s 1 day’s work = 1/n
If A’s 1 day’s work = 1/n, then A can finish the work in n days.
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 can do a work in ‘x’ days and B can do the same work in ‘y’ days, then the number of days required to complete the work if A and B work together is
♦ If A can do a work in ‘x’ days and A + B can do the same work in ‘y’ days, then the number of days required to complete the work if B works alone is
Universal Rule on Time and Work
M1D1W2 = M2D2W1
M1D1T1W2 = M2D2T2W1 (When time is given )
M1D1T1E1W2 = M2D2T2E2W1 (When efficiency is added)
Time and work questions are asked in every competitive exam. There is always one or more aptitude questions from this section of quantitative aptitude. Problems on time and work which appear in CAT exams are quite advanced and complicated – But they can be solved easily if you know the basic formulas, shortcuts and tricks.
In the video given below you will learn Time and Work concept, Tricks and Formulas which are very useful for almost every competitive exams.