Venturimeter - GATE ME '15 S1

Water (ρ=1000 kg/m^3) flows through a venturimeter with an inlet diameter of 80 mm and a throat diameter of 40 mm. The inlet and throat gauge pressures are measured to be 400 kPa and 130 kPa respectively. Assuming the venturimeter to be horizontal and neglecting friction, the inlet velocity (in m/s) is ___________.