Fluid Flow: Ideal incompressible water is flowing in a drainage channel of rectangular cross-section. At one point, the width of the channel is 12 m, the depth of water is 6.0 m, and the speed of the flow is 2.5 m/s. At a point downstream, the width has narrowed to 9.0 m, and the depth of water is 8.0 m. What is the speed of the flow at the second point?
A. 2.0 m/s
B. 2.5 m/s
C. 3.0 m/s
D. 3.5 m/s
E. 4.0 m/s
Answer: B
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