The length, breadth and height of a cuboid are in the ratio of 3 : 4 : 5 and its volume is 3840 cm3. The smallest side has a length of?

16 cm 12 cm 10 cm 15 cm

12 cm

Volume = l × b × h 3840    = 3R × 4R × 5R 3840    = 60 R3 R3        = 64 R         = 4 Smallest side is = 3R = 3 × 4 = 12 cm