A solid cuboid with edges 1 cm, 2 cm and...

A solid cuboid with edges 1 cm, 2 cm and 3 cm is suspended in vacuum, its temperature falls from `100^(0)C` to `90^(0)C` in 100s. Another solid cuboid of same material and similar surface finish is kept in same enclosure. If sides of couboid are 2 cm, 4 cm and 6 cm, then time ttaken for this cuboid to cool from `100^(0)C` to `90^(0)C` will be

100s

150 s

50s

200s

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