Supermarket cashiers

When at the supermarket are opened only 2 cash people waiting in the front approximately 12 minutes. How many will shorten the average waiting time in a front where supermarket open another three cashiers?

Correct result:

x =  7.2 min

Solution:

2:(2+3)=d:12  d=12 22+3=245=4.8 min  x=12d=124.8=365=365 min=7.2 min



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