Final answer:
The combined fluid resistance of two water pipes in series is the sum of their individual resistances, which is 9.42 kPa/m³.
Step-by-step explanation:
The combined fluid resistance of two water pipes connected in series can be found by simply adding their individual resistances together.
Given that the first pipe has a fluid resistance of 4.53 kPa/m³ and the second pipe has a resistance of 4.89 kPa/m³, the total resistance when these pipes are connected in series is:
Total Resistance = Resistance of Pipe 1 + Resistance of Pipe 2 = 4.53 kPa/m³ + 4.89 kPa/m³ = 9.42 kPa/m³.