Physics

Problem

A hiker stands between two vertical cliffs and fires a gun. He hears the first echo

0.90\,\text{s}

after the shot from the cliff in front of him and the second echo

1.50\,\text{s}

after the shot from the cliff behind him. If the speed of sound in air is

340\,\text{m/s}

, what is the distance between the two cliffs? a)

306\,\text{m}

408\,\text{m}

255\,\text{m}

396\,\text{m}