Question

you work as an engineer for a construction company. you are excavating a pit that is 1,200 feet long and 22 feet wide to a depth of 18 feet. you need to remove the dirt excavated from the site using dump trucks. a dump truck can carry 480 cubic feet of dirt per load. how many loads will be needed to carry away all the dirt excavated from the pit?

a. 2
b. 3
c. 70
d. 814
e. 815

Explanation:

Step1: Calculate volume of pit

$V = l\times w\times h=1200\times22\times15 = 396000$ cubic - feet

Step2: Determine number of truck - loads

Number of truck - loads $n=\frac{396000}{486}\approx814.81$
Since we can't have a fraction of a truck - load and we need to remove all the dirt, we round up to 815.

Answer:

E. 815