You ask how should she proceed? To minimize her time or what?
Walking gets her there in Pi/2 hours while rowing gets her there in 2 hours.
If you simply want the expression defining the total time taken by doing both,
T = 2cosµ + Piµ/45
The distance rowed from A to C is Dr = 4cosµ
The distance walked from C to B is Dw = (2µ/180)2Pi = Piµ/45.
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