A given pressure difference produces a flow rate of 3.0 L/min through one tube and 6.0 L/min through another tube. What would the flow rate be if these tubes were hooked together so that the fluid flow through them sequentially? The pressure difference remains the same.

a.

7 cm^3/s

b.

3 cm^3/s

c.

2 cm^3/s

d.

9 cm^3/s