1. The problem statement, all variables and given/known data Flow rate in Venturi meter of Petrol (SG 0.85). Diam1 - 0.2m Diam2 - 0.15m Height Diff in manometer of Mercury (SG 13.6) 0.012m, so Δp= 13600 x 9.81 x 0.012 = 1601? Cd = 0.98 2. Relevant equations Bernoulli, p/ρg + U2/2g + Z U=Q/A 3. The attempt at a solution Inserting and equating the values into bernoulli i ended up with, 0.192 = Q22/0.093 - Q12/0.058 Not sure if this i right because i can't seem to go anywhere from here. THE GIVEN ANSWER IS 39.3 l/s Thanks a lot for any help.