Question

what is echo and echo time​

Answer 1

Answer:

Eco-Friendly System Will Make Indian Railways 'Silent', More Efficient. ... New Delhi: The Indian Railways has announced that it will replace the power generator cars placed at either end of trains and instead run them through power drawn from an overhead electric supply system.

Hope it will help you ✌️✌️

Plz mark me as brainliest

Answer 2

Answer:

echo is the sound reflected that we hear

time for 1 echo is 17.5 sec