031 Review Problem - Cost of mainline sewer pipe

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Problem 31
One section of the mainline sewer pipe for the city of Annapolis passes through a tunnel 484 ft. long. The cross section of the tunnel is shown in the figure. The sewer pipe is 16 in. in external diameter and is partially embedded, in a mattress of concrete, a cross section of which is shown in the figure. Find the total cost (a) of digging the tunnel at $5.00 per cubic yard, (b) of pouring of concrete at $9.00 per cubic yard.
 

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Solution 31

 

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