The greatest angle of elevation will occur from the point on AB closest to C.

The shortest distance from a point on AB to C is approximately 42m.

(http://www.enotes.com/homework-help/diagram-abc-represents-horizontal-triangular-453131)

The angle of elevation can be found from the point on AB, Q, that is the closest to C by `tan/_PQC=23/42==> m/_PQC=tan^(-1)(23/42)~~28.7^@`

Thus the greatest angle of elevation is approximately 28.7 degrees.

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