Quantitative Aptitude Time and Work Study Material

Quantitative Aptitude Time and Work Study Material

  The number of persons (P), the quantity of work (W) and the period of time taken (T) are important variables in problems related to Time and Work. In other words, the amount of work done depends on these factors. There can be several ways of solving such problems but it is always advisable to use the one which is least error-prone and least time-consuming. Further, emphasis must be on understanding the logic/concept underlying the solutions to the problems rather on than memorizing them. See Also:

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Time (T) taken to do a work depends not only on how many persons are engaged to do it but also on how efficient they are. Efficiency here means rate of doing the work. This aspect comes into picture when the problem involves comparison of works being done by different categories of persons. For instance, efficiencies of man, woman, boy, girl, in general, are different. Even Efficiency of one man may not be the same as that of the other; but unless otherwise specifically stated in the problem, all men working in a group are assumed to do work with equal efficiency. The same is applicable to any group of women or any group of boys etc. Time period (T) taken to do work is usually given in number of days. But in many Cases, in addition to the number of days, the problem also specifies the number of hours per day that the person is wording. In such cases, we use time (T) in broader sense. That is to say, it includes not ' only the number of days for which the person works but also the number of hours per day that he or she works. Thus, time (T) here is the product of number of days (say D) and working hours per day (say H) i.e.; T=DxH The problems on Time and Work can be solved by following two methods: (i) Ratio and Proportion Method : We discussed the application of Ratio and Proportion in the said chapter earlier for solving such problems. ‘ (ii)Unitary Method : This is a very simple and useful method. The only disadvantage of this method is that sometimes it takes too much time to find the answer. But it is easier to understand. The term Unitary is more or less self-explanatory. Unitary means one. In this method we first proceed to reduce the problem to either work done by one person or work done in one day or persons/time required to do one work and so on as per the requirement of the problem. Then, we move to the next stage, step-by-step to arrive at the final result. Get more at Quantitative Aptitude Time and Work Study Material