Kishan and Shyam while returning from P work on their bicycles have to cross a W railway crossi...

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Kishan and Shyam while returning from
P work on their bicycles have to cross a

W railway crossing barrier which is closed indicating that some train is expected to pass through soon. Not having any idea that in how much time will the gate open and not hearing any sound of the train, Kishan tries to jump the barrier. Shyam bends down, puts his ear on the tracks and immediately pulls back Kishan and in a fraction of a minute a superfast train passes by. Shyam scolds his friends and
warns him to never take such risks in future.
a. Why did Shyam put his ear on the tracks?
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