Trench

The trench is a four-sided prism. The cross section has a trapezoidal shape with basements of 4m and 6m, the length of the trench is 30m. What is the depth of the trench if we dig 60,000 l of soil.

Correct result:

h =  0.4 m

Solution:

a=4 m c=6 m s=(a+c)/2=(4+6)/2=5 m l=30 m V=60000/1000=60 m3 S=V/l=60/30=2 m2 S=s h h=S/s=2/5=25=25 m=0.4 m



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