A bullet having a velocity of 680 m/s hits a target 510 m away. If the temp. of the air was 18 degrees celsius, how long after the bullet was fired did she hear it hit the target?

1 answer

Figure two things
a) time it takes bullet to hit target: time=distanc/velocitybullet
b) time for sound to travel back to the shooter
time= distance/velocitysound

Add those two times.