Quantitative - Time and work

Time and work Description

1. If A can do a piece of work in n days, then work done by him in 1 day = 1/n.
2. If A's 1 day's work = 1/n, then A can finish the whole work in n days.
3. Ratio:- If A is twice as good a workman as B, then:
    Ratio of work done by A and B = 2:1     
    Ratio of time taken by A and B = 1:2.
4. If the number of men to do a certain work be changed in the ratio m:n, then the ratio of time taken to finish the work, changes in the ratio n:m.
The basic formula for solving work problems is 1/r + 1/s = 1/h where r and s are the number of hours it takes two people R and S respectively, to complete a job when working alone, and h is the number of hours it takes R and S to do the job when working together. 1/time 1 + 1/time 2 = 1/total time                  
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