Dimensions 81909

The foundation pit for building houses has a face of blocks with dimensions of 10 meters, 10 meters, and 2 meters. After a heavy rain, the water is filled to the brim. The pump pumps out 10 m³ of water in 1 hour. In how many hours will the pit be empty?

Correct answer:

t =  20 h

Step-by-step explanation:

$$\begin{gathered} a=10\text{m} \\ b=10\text{m} \\ c=2\text{m} \\ V=a\cdot b\cdot c=10\cdot 10\cdot 2=200{\text{m}}^3 \\ Q=10{\text{m}}^3\text{/h} \\ Q=V/t \\ t=V/Q=200/10=20\text{h} \end{gathered}$$

Try another example