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A person standing between two parallel hills fires a gun and hears the first echo after t1 sec and the second echo after t2 sec. The distance between the two hills is …..

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Distance between man and hill 1, d1 = v x \(\frac{t_1}{2}\)

Distance between man and hill 2 , d2 = v x \(\frac{t_2}{2}\)

Distance between the two hills, 

d = d1 + d2 

d = \(\frac{v(t_1 + t_2)}{2}\)

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