Physics

Problem

A student stands

60\,\text{m}

away from the left wall of a long, empty corridor whose right wall is parallel to the left one. He claps loudly and hears two distinct echoes: the first after

0.35\,\text{s}

and the second after

0.85\,\text{s}

. If the speed of sound in air is

340\,\text{m/s}

, what is the separation between the two walls? a)

170\,\text{m}

205\,\text{m}

145\,\text{m}

290\,\text{m}

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