A person standing between two parallel hills fires a gun. He hears the first echo after 1.5 sec and second echo after 2.5 sec. If the speed of a sound is 332 $ms^{-1}$, the distance between the hills is
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Total distance = $\frac{v(t_{1} + t_{2})}{2}$. Just add the times and multiply by speed divided by 2.