Time and Work Questions for Banking and Sarkari Naukri Examinations.

## Time and Work – Quantitative Aptitude

Basic Concepts :

1) If A can do a work in ‘a’ days, then work done by him in 1 day is 1/a.
If B can do a work in ‘b’ days, then work done by him in 1 day is 1/b.
Then, in one day, if A and B work together, then work done by them in 1 day,
= (1/a + 1/b);
= (a+b)/ab.

In this case, we take the total work to be done as 1. Hence, the work will be completed when 1 unit of work is completed.

2) Suppose, A and B are working to build a wall while C is working to break the wall. In such case, the wall is being built by while it is broken by C. here, we consider that A and B are doing positive work in building the wall while C is doing a negative work as he is breaking the wall.

3) Work done per unit time is known as efficiency. It is also known as Work Rate.
Efficiency = Work done/time

4) The work equivalence is an application of the efficiency and formula,
Work rate * time= work done