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Thermofluids help

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1. Oilof relative density 0.8 flows at the rate of 216000m3/s through afalling pipe which tapers gradually in the direction of flow. The diameter at apoint A is 0.6m and at point B, 3.6m vertically below A, it is 0.3m.
1. The gauge pressure at A is84kN/m2. Calculate the pressure at B. Ans. 109kN/m2 gauge
So what i did first was USE the continuity equation to find the velocity of A and B
Volumetric flow rate/pi(r)^2 = velocity

and then i just inputted it into bernies equation

3.6 + (84*10^3)/9.81*800 + (7.639*10^5)^2/2*981 = 0 + P/(800*9.81) + (3.0558*10^6)^2/(2*9.81)

rearranged to find p at b and it's always wrong, what am i doing wrong? the 7.639 and 3.0558 are the sppeds i calculated
2. i keep getting a negative answer

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Updated: May 21, 2016
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