A cube shaped casting solidifies in 5 min. The solidification

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A cube shaped casting solidifies in 5 min. The solidification time in min for a cube of the same material, which is 8 times heavier than the original casting, will be

1. 10
2. 20
3. 24
4. 40

Correct Option: B

t ∝ (V/A)² and m₂ = 8m₁,
ρV₂ = 8ρV₁
⇒ V₂ = 8V₁
a₂ = 2a₁ ⇒ t₂ = 4t₁