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:

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

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