A Tube Is Mounted on a Railcar Which Is Moving $\circ$

Multiple Choice

A tube is mounted on a railcar which is moving at 30 m/s.Rain is falling vertically at a constant rate of 12 m/s.The minimum angle of tilt of the tube for not getting any rain on its inside is

A) 45.1 ^$\circ$ .
B) 28.5 ^$\circ$ .
C) 21.8 ^$\circ$ .
D) 18.4 ^$\circ$ .