See beta, sound needs time to go, hit something, and come back to your ear. At that speed, it takes about 0.1 seconds for a round trip to hear a separate echo, so 17.2 metres is the maths.
But in my salon, when Mrs. Sharma shouts from the shampoo chair to ask if her tea is ready, I hear her echo immediately off the tiles—and that wall is only 5 metres! Her voice is so strong it breaks the rule, *sahi ka*?
My life says sometimes the book answer is too quiet for real people.
#exams#study
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