###
**In a certain factory there are five workers A, B, C, D and E. A can complete a work in 4 minutes, B in 5 minutes, C in 6 minutes, D in 10 minutes and E in 12 minutes. The average number of units of work completed per worker per minute will be-
**

A. 0.16
B. 0.172
C. 0.80
D. 0.87
**Answer: Option A**

## Show Answer

Solution(By Apex Team)

Number of units of work completed by the five workers in 1 minute:
$\begin{aligned}&A\rightarrow\frac{1}{4}\\
&B\rightarrow\frac{1}{5}\\
&C\rightarrow\frac{1}{6}\\
&D\rightarrow\frac{1}{10}\\
&E\rightarrow\frac{1}{12}\\
&\therefore\text{ Required average }\\
&=\frac{\left(\frac{1}{4}+\frac{1}{5}+\frac{1}{6}+\frac{1}{10}+\frac{1}{12}\right)}{5}\\
&=\left(\frac{4}{5}\times\frac{1}{5}\right)\\
&=\frac{4}{25}\\
&=0.16\end{aligned}$

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