A 450 m long freight train passes through a tunnel at a speed of 20 m/sec.

The Question: A 450 m long freight train passes through a tunnel at a speed of 20 m/sec.On the return journey it takes 45 sec longer for the train to pass completely through the same tunnel when it travels at a lower speed of 15 m/sec. How long is the tunnel?

The correct answer is 5000.

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