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It means to use the shore as the frame of reference. In other words, describe the motion of the boat from the point of view of someone standing on the shore.
you mean like this????
Lets say , my car is going with 10 meter /second 1-My velocity relative to the ground is 10 m/s (Ground is not moving) 2-My relative velocity to an another car going (same direction) with 10meter/second is zero. If it was going opposite direction with 10m/s , my relative motion would be 20m/s. You can see this in real life. look cars when you are in car..if they are going with same as your car, you see them as they stop
ok so if the water was still, her relative velocity to shore would be 2.5km/h but since there is a water current of 1.5km/h, how do i figure out her relative velocity between her and the shore.