PDF chapter test TRY NOW

A man is standing between two vertical walls \(680\) \(m\) apart. He claps his hands and hears two distinct echoes after \(0.9\) seconds and \(1.1\) second respectively. What is the speed of sound in the air?
 
The speed of the sound can be found using the formula,
 
 
The speed of sound in air is  \(m/s\)