# The length of the ravine is 150 m, the average depth is 3 m, and the width is 8 m. What area of land is occupied by the ravine

November 10, 2020 | Education

| **The length of the ravine is 150 m, the average depth is 3 m, and the width is 8 m. What area of land is occupied by the ravine and what is the volume and mass of the rocks removed from it, if their density is 1.4 g / cm3.**

1) Find out the average area of the ravine:

150 m × 8 m = 1200 m2 or 0.12 ha

2) Determine the volume of rocks removed:

1200 m2 × 3 m = 3600 m3 = 36 × 108 cm3

3) Find the mass of rocks taken out of the ravine:

m = V × p = 36 × 108 cm3 × 1.4 g / cm3 = 50.4 × 108 g = 50.4 × 105 kg, i.e. 5 thousand 40 tons

Answer: The area of the ravine is 0.12 hectares. The volume of rocks removed is 3600 m3. The mass of the removed rocks is 5 thousand 40 tons.

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