Water level

To cuboid-shaped poll, bottom size 2m and 3.5m; flows water at a rate of 50 liters per minute.
How long will it take for water to reach level 50 cm?

Correct answer:

t =  70 min

Step-by-step explanation:

$$\begin{gathered} a=2\cdot 10=20\text{ dm } \\ b=3.5\cdot 10=35\text{ dm } \\ c=50\mathrm{/}10=5\text{ dm } \\ V=a\cdot b\cdot c=20\cdot 35\cdot 5=3500{\text{dm}}^3 \\ v=50{\text{dm}}^3\text{/s } \\ t=V\mathrm{/}v=3500\mathrm{/}50=70\text{ min} \end{gathered}$$

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