One press

One press will produce one truck of respirators in 3.5 days. The second in 10 days. How long does it take to fill a truck while working together?

Correct result:

t =  2.5926 d

Solution:

 t⋅ (1/3.5+1/10)=1  3.857143t=10  t=7027≐2.592593=2.5926 d

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