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1. A can complete a certain 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 by them per minute will be = ?

A. 0.16

B. 0.40

C. 0.80

D. None of these

Solution:

\begin{aligned} Required average, \\ = \frac{\frac{1}{4} + \frac{1}{5} + \frac{1}{6} + \frac{1}{10} + \frac{1}{12}}{5} \\ = \frac{48}{60} \times \frac{1}{5} \\ = \frac{4}{25} \\ = 0.16 \end{aligned}

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