Time and work part 1

Time and work:



method: Fraction Technique

A = 10 days i.e so work done in a day is 1/10^th.

2^nd 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