Question

A man standing between two hills and produces a sound then time for third echo will
noticed if t1, and t2, be the time for 1st and 2nd echo respectively.
a) t= tz + 2t1 b) t = 2t2 + t c) t= t; + 3t2 d) t= 3t+ tz
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Answer 1

Answer:

t = 3t + tz as t1 be the first eco and t2 be the second one so t1 will be tz + 3t