A river narrows at a rapids from a width of 15m to a width, Ask an Expert

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A river narrows at a rapids from a width of 15m to a width of only 6.0m. The depth of the river before the rapids is 2.7m ; the depth in the rapids is 0.70m.

Find the speed of water flowing in the rapids, given that its speed before the rapids is 1.4m/s. Assume the river has a rectangular cross section.

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