The figure below shows the merging of two streams to form a
river. One stream has a width of 8.4 m, depth
of 4.5 m, and current speed of 2.3 m/s. The
other stream is 7.5 m wide and 3.2 m deep, and
flows at 2.1 m/s. The width of the river
is 10.0 m, and the current speed is 2.9 m/s.
What is its depth?
m