Time And Work questions formula for placement

Time And Work questions formula for placement

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.

4.     No. of days = total work / work done in 1 day

5.     Relationship between Men and Work

More men         ------- can do ------->             More work

Less men         ------- can do ------->             Less work

6.     Relationship between Work and Time

More work        -------- takes------>               More Time

Less work         -------- takes------>               Less Time

7.     Relationship between Men and Time

More men        ------- can do in ------->          Less Time

Less men          ------- can do in ------->          More Time

8.     If M₁ persons can do W₁ work in D₁ days and M₂ persons can do W₂ work in D₂ days, then 

        

9.     If M₁ persons can do W₁ work in D₁ days for h₁ hours and M₂ persons can do W₂ work in D₂ days for h₂ hours, then

 Note:  If works are same, then M1D1h1 = M2D2h2 

10.  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

11.  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