In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is_________________?
(A) 22.5 m/sec
(B) 33 m/sec
(C) 40 m/sec
(D) 90 m/sec
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