A cannon is fired from town X,after how long is the sound heard at a town Y 4.95 km away? [velocity of sound in the air = 330 ms-1]

A cannon is fired from town X,after how long is the sound heard at a town Y 4.95 km away?

[velocity of sound in the air = 330 ms-1]

Answer Details

V = (2X)/t
330 = (2 x 4.95 x 103)/t
t = (9.9. x 103/330 = (9900)/330 = (90)/3
= 30 secs