Blueberries

5 children collect 4 liters of blueberries in 1.5 hours.
a) How many minutes do 3 children take 2 liters of blueberries?
b) How many liters of blueberries will be taken by 8 children in 3 hours?

Correct result:

t =  75 min
V =  12.8 l

Solution:

$$\begin{gathered} h={\displaystyle \frac{4}{1.5\cdot 5}}={\displaystyle \frac{8}{15}}\doteq 0.5333\text{ l/h/h } \\ {t}_1={\displaystyle \frac{2}{3\cdot h}}={\displaystyle \frac{2}{3\cdot 0.5333}}={\displaystyle \frac{5}{4}}=1.25\text{ h } \\ t=t_1\to \text{ min}=t_1\cdot 60\text{ min}=1.25\cdot 60\text{ min}=75\text{ min} \end{gathered}$$

$V=8\cdot 3\cdot h=8\cdot 3\cdot 0.5333={\displaystyle \frac{64}{5}}={\displaystyle \frac{64}{5}}\text{ l}=12.8\text{ l}$

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