Question

A man heard two echos after 5 s and 3 s after clapping between two hills. The distance between the two hills is ___ (speed of sound in air is 1224 kmph)​

Answer 1

Answer:

Time taken to hear echo from 1st hill = 5 second

Time taken to hear echo from 2nd hill = 3 second

Speed of sound = 1224 kmph = (1224/3.6) meter per second = 340 meter per second

As we know,

distance = speed * time

So,

Distance between the man and 2nd hill = 340 mps * 3 = 1029 m

Distance between the man and 1st hill = 340 mps * 5 = 1700 m

distance between 2 hills is 1029 + 1700 = 2729 m or 2.729 km