Blueberries

Marie earns 3 liters of blueberries for 3.4 hours, Peter 2.4 liters for 2.9 hours.

How long have earns together one liter?

Correct answer:

t =  0.58 h

Step-by-step explanation:

$$\begin{gathered} v_1=3\mathrm{/}3.4=0.882l\mathrm{/}h \\ {v}_2=2.4\mathrm{/}2.9=0.828l\mathrm{/}h \\ t={\displaystyle \frac{1l}{v_1+v_2}}={\displaystyle \frac{1}{0.882+0.828}}=0.58\text{ h} \end{gathered}$$

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