A pitot tube is used to measure the mean velocity in a pipe where water is flowing. A manometer containing mercury ia connected to the pitot tube and indicates a height of 150 mm. The specific weights of the water and mercury are 9810 N/m³ and 133,400 N/m³, respectively. Calculate the velocity of the water?
A. 6.09 m/s
B. 12.87 m/s
C. 18.42 m/s
D. 24.90 m/s