A rectangular water reservoir has a base of 18 m x 16 m. Water flows in through a pipe of cross-sectional area 4 cm x 3 cm at the speed of 12 m/sec. In 20 min the water in the reservoir will rise by:(CTS COMPANY)

• A. 5 cm
• B. 4 cm
• C. 6 cm
• D. 1 cm