A steel vessel has a base of length 60 cm and breadth 30 cm. Water is poured in the vessel. A cubical steel box having edge of 30 cm is immersed completely in the vessel. How much will the water rise? Choose the correct choice:
A) 7.5 cm rise B) 10 cm rise C) 15 cm rise D) 30 cm rise E) none of these

Rationale: explanation : volume of cube = a 3 = a * a * a 60 cm * 30 cm * h = 30 cm * 30 cm * 30 cm h = 15 cm answer is c
Answer: C