An echo is heard after 0.6 s when a boy fires a cracker, 99 m away from a tall building then the speed of sound is

An echo is heard after 0.6 s when a boy fires a cracker, 99 m away fro

1.	An echo is heard after 0.6 s when a boy fires a cracker, 99 m away from a tall building then the speed of sound is
A.	165 m / s
B.	330 m / s
C.	340 m / s
D.	350 m / s
Answer» C. 340 m / s