Time and work part 1

Time and work:



method: Fraction Technique
A = 10 days i.e so work done in a day is 1/10th.
2nd Method: Efficiency Technique
Work done by a person in unit time is defined as efficiency in Time and Work Problems
A = 10 days so efficiency of A per day = 100/10 = 10%

  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

2. 
A can lay railway track between two given stations in 16 days and B can do the same job in 12 days. With help of C, they did the job in 4 days only. Then, C alone can do the job in:
A.
9 1 days
5
B.
9 2 days
5
C.
9 3 days
5
D. 10

See below

Time and work part1

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