Question

To hear an echo the time can be 0.2 seconds or not

Answer 1

time period between hearing the original sound and its echo should not be less than 0.1 of a second .

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Answer 2

Time can be 0.2 secs or more ...the reflected sound or echo  must reach at least o.1 sec later after the original sound is heard .the reason is that the sensation of sound persists in our ears for about 0.1 sec after the existing stimulus ceases to act.