Two streams merge to form a river. One stream has a width of 8.7 m, depth of 3.8 m, and current speed of 2.2 m/s. The other stream is 6.8 m wide and 3.3 m deep, and flows at 2.7 m/s. If the river has width 11.2 m and speed 2.8 m/s, what is its depth?
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