Minute average

In a factory, four workers are assigned to complete an order received for dispatching 1400 boxes of a particular commodity. Worker A takes 4 mins per box, Worker B takes 6 minutes per box, C takes 10 mins per box, D takes 15 mins per box. Find the average minutes taken per box by the group of workers.

Correct result:

b =  1.714 min

Solution:

$b={\displaystyle \frac{1}{1\mathrm{/}4+1\mathrm{/}6+1\mathrm{/}10+1\mathrm{/}15}}={\displaystyle \frac{12}{7}}=1.714\text{ min}$

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