Mathematics, 25.09.2021 03:00, caityi9619

The train is 100 metres long and approaching a 3000 metre long tunnel. 30 seconds would pass if the front car and last train car exit the tunnel.
How do I determine the constant speed of something in kilometres per hour?

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The train is 100 metres long and approaching a 3000 metre long tunnel. 30 seconds would pass if th...