Time and Work Questions – General Questions Practice Online Aptitude Test and find out how much you score before you appear for your next interview and written test.

Time and Work Formula

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.

Time And Work Tricks

Time= Work done/Efficiency

• When work is same.

 Time∝1/Efficiency

• If A can do a piece of work in n days.

                                               Then, per day working efficiency of A = 1/n

• If working efficiency of A & B is → x : y.

Then, the time taken by A & B to finish the work is in the ratio → y : xe.g. If A does three times faster work than ‘B’, then the ratio of work done by A and B is 3: 1.               

Then, Ratio of time taken by A & B = 1 : 3

• If A can do a piece of work is x days and B can do a piece of work in y days, then both of them working together will do the same work in

xy/(x+y)  days

• If A, B & C will working alone, can complete a work in x, y and z days, respectively, then they will together complete the work in

xyz/(xy+yz+zx)

• Two persons A & B, working together, can complete a piece of work in x days. If A, working alone, can complete the work in y days, then B, working alone, will complete the work in

⇒xy/(y-x)

• If A & B working together, can finish a piece of work is x days, B & C in y days, C & A in z days. Then, A + B + C working together will finish the job is

⇒2xyz/(xy+yz+zx)

• If A can finish a work in x days and B is k times efficient than A, then the time taken by both A and B, working together to complete the work is

x/(1+k)

• If A & B working together can finish a work in x days & B is k times efficient than A, then the time taken by,

A working Alone will take ⇒ (k + 1) x

B working Alone will take ⇒ ((k+1)/k)x

• If A working Alone takes a days more than A & B,  & B working Alone takes b days more than A & B. Then ,

Number of days, taken by A & B working together to finish a job is = √ab

Time and Work Questions

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