Book Maths Puzzle

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)?

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Book Other Question

Two trains are running at 40 km/hr and 20 km/hr respectively in the same direction. If the fast train completely passes a man sitting in the slower train in 5 seconds, the length of the fast train is :? A train crosses a post in 15 seconds and a platform 100 m long in 25 seconds. Its length is?