In the calm waters of an inlet, Manon's boat moves with a velocity (speed and direction) vector \vec{b_1} = (3,4) b 1 =(3,4)b, start subscript, 1, end subscript, with, vector, on top, equals, (, 3, comma, 4, ). Once it enters the main river channel, however, Manon observes that it is now moving with a velocity vector \vec{b_2} = (1,1) b 2 =(1,1)b, start subscript, 2, end subscript, with, vector, on top, equals, (, 1, comma, 1, ).