Book Maths Puzzle

A train crosses a post in 15 seconds and a platform 100 m long in 25 seconds. Its length is?

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Book Other Question

A train , 800 meter long is running with a speed of 78 km/hr. It crosses a tunnel in 1 minute. What is the length of the tunnel (in meters)? A train , having a length of 110 meter is running at a speed of 60 kmph. In what time, it will pass a man who is running at 6 kmph in the direction opposite to that of the train