(2) CE⊥AD at point E after point C,

Judging from the meaning of the question, AB=30m, ∠ CAD = 30, ∠ CBD = 60,

Therefore, ∠ ACB = ∠ cab = 30,

You can get AB=BC=30m,

Let BE=x, and in Rt△BCE, CE=3x can be obtained.

And ∵BC2=BE2+CE2, that is, 900=x2+3x2,

Solution: x= 15, CE = 153m.

A: The width of the river in front of Xiaolijia is153m. ..