Sound is emitted from a source placed at one end of a metallic tube of length 664 m. Two sounds are heard at an interval of 1.5 seconds on the other end of the tube. Then the velocity of sound in metal is : (velocity of sound in air is 332 m/s)
(A) 1328 m/s
(B) 664 m/s
(C) 190 m/s
(D) 1162 m/s