Workers

Workers digging a jump pit in the school yard. Pit has a cuboid shape with a length 12 m, a width 20 dm and depth 36 cm. They excavate 0.4 cubic meters of soil an hour. How much time (hours and minutes) is need to the excavate this pit?

Result

x = 21:36 h

Solution:

$$\begin{gathered} V=abc=12\cdot 2\cdot 0.36=8.64m^3 \\ x=V\mathrm{/}0.4=21.6h=21:36\text{ h} \end{gathered}$$

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