The Volume of a wall, 5 times as high as it is broad and

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The Volume of a wall, 5 times as high as it is broad and 8 times as long as it is high, is 12.8 m³. The breadth of the wall is ?

1. 30 cm
2. 40 cm
3. 22.5 cm
4. 25 cm

Correct Option: B

Let breadth = L meters. Then, height = 5L meters and length = 40L meters
∴ L x 5L x 40L = 12.8
⇒ L³ = 12.8/200 = 128/2000 = 64/1000
∴ L = 4/10
Thus, breadth = (4/10) m = (4 x 100)/10 cm = 40 cm