SOLUTION: A 20 km long, 8 m wide, two-lane highway is to be paved with a 4 cm thick layer of asphalt. A fleet of three dumptrucks is to be employed, each with an empty mass of 20 metric tons

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Question 893054: A 20 km long, 8 m wide, two-lane highway is to be paved with a 4 cm thick layer of asphalt. A fleet of three dumptrucks is to be employed, each with an empty mass of 20 metric tons and a carrying capacity of 20 m^3. Asphalt with a density of 0.72 g/cm^3 will be used. Determine …
a.the total volume of asphalt needed
b.the number of dumptruck loads required
c.the gross mass of each truck
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
This will maybe misunderstand the "two-lane highway" part, but the volume of asphalt is 20000%2A8%2A0.04%2Am%5E3=highlight%286400%2Am%5E3%29 of asphalt. That is for VOLUME of the asphalt.

MASS of the asphalt:

6400%2A1000000%2A0.72%2F1000
6400%280.72%29%2A1000
highlight%284608000%2Akilograms%29

Again, as said, I may be misunderstanding the "two-lane highway" part of the description. I have assumed that each lane is 4 m wide and that the highway has two of these lanes.

(CORRECTED EARLIER MISTAKE)