Question

A boy is sitting in the middle of a park of dimensions 10m*10m.On the right side of it there is a building adjoining the park and on the left side,there is a road adjoining the park.A sound is produced by a cracker on the road.Is it possible for the boy to hear the echo? Explain.

Answer 1

it depends on the distance and loudness of sound produced from the boy 
 so,
it may or may not be both.