4. The first time an engineer collected soil samples and tested the soil it took 39.5 days to complete the work. The second time the engineer did the work, it took 36.8 days. Using an improvement rate based on individual units, answer the following questions: a. How long will it take the engineer to complete the work for the 9th and 12th project? b. How much longer will it take to do the work on the 10" project than the 11t project?

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Asphalt Binders and Mixtures

Asphalt binders are subsidiary products procured during the refining process of petroleum while manufacturing gasoline, diesel, and similar petroleum products. Asphalt binders are obtained from the residue that remains after the distillation of petroleum, this residue is further subjected to steam distillation and oxidation to remove the traces of gas oil present in the residue. Certain additives or modifiers are also added to asphalt binders to alter them to suit different applications.