Explanation:
Given that,
Diameter =100 mm
Volume = 100 liter
Time = 45 min
Viscosity = 0.005 Pas
Density = 900 kg/m³
(a). We need to calculate the volume flow rate of oil
Using formula of flow rate

Put the value into the formula


The volume flow rate of oil is 
(b). We need to calculate the mean velocity in the pipe
Using formula of mean velocity


Put the value into the formula


The mean velocity in the pipe is
.
(c). We need to calculate the Reynolds number
Using formula of the Reynolds number

Put the value in to the formula


The Reynolds number is 84.6.
(d). We need to calculate the maximum velocity in the pipe
Using formula of maximum velocity

Put the value into the formula


The maximum velocity in the pipe is 
Hence, This is the required solution