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=11/4+1/6+1/10+1/15=127=1.714 min



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