Internal length, breadth and height of a rectangular box

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Internal length, breadth and height of a rectangular box are 10 cm, 8 cm and 6 cm, respectively. How many boxes are needed which can be packed in a cube whose volume is 6240 cu. cm. ?

1. 12
2. 13
3. 15
4. 17

Correct Option: B

Volume of rectangular box = 10 x 8 x 6 = 480 cm³
Volume of cubes = 6240 cm³
∴ Required boxes = Volume of cubes / Volume of rectangular box
= 6240/480 = 13
Hence, 13 boxes are needed.