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 answer:

t =  2.5926 d

Step-by-step explanation:

$$\begin{gathered} t\cdot (1\mathrm{/}3.5+1\mathrm{/}10)=1 \\ 3.857143t=10 \\ t={\displaystyle \frac{70}{27}}\doteq 2.592593=2.5926\text{ d} \end{gathered}$$

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