1. A boy shouts while standing in front of a hill at a distance of 800m. The boy hears the echo of his shout after 4.8 seconds. Find the speed of sound.

time taken to reach the cliff = 4.8/2 = 2.4s
speed = distance *time
=800/2.4 = 333.33 m/s
 

total distance travelled by sound waves= 800m * 2 = 1600m Total time taken= 4.8 seconds Speed= Distance/Time = 1600m/4.8s = 333.33 m/s Therefore, the speed of sound is 333.33 m/s Or speed=d/t=1600/2.4s=333.33m/s

total distance travelled by sound wave is 800*2 = 1600 m .
total time taken = 4.8 s 
s = d/t
1600/4.8=333.33 m/s