Velocity of the oil in the pipe: 0.76 m/s, in the constricted section: 5.87 m/s
Explanation:
We can solve this problem by using Bernoulli's equation:
 (1)
where
 is the pressure in the pipe
 is the pressure in the constricted section
 is the density of the oil
 is the velocity of the oil in the pipe
 is the velocity of the oil in the constricted section
Also, according to the continuity equation,

where
 is the cross-sectional area of the pipe, with
 is the radius
 is the cross-sectional area of the constricted section, with
 is the radius
So the equation becomes

So we can write

Substituting into eq.(1),

And solving the equation for 
:

And the velocity in the constricted section is

Learn more about flow rate:
brainly.com/question/9805263
#LearnwithBrainly