In a Venturimeter, the diameter of the pipe is 4 cm and that of constriction is 3 cm. When water flows, the heights of water level in pressure tubes are 15 cm and 20 cm. The discharge rate of pipe will be _____? (take g = 10 m/s2)
1
855 cm3/s
2
655 cm3/s
3
755 cm3/s
4
955 cm3/s