Book Maths Puzzle

A train moves past a post and a platform 264 m long in 8 seconds and 20 seconds respectively. What is the speed of the train?

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Book Other Question

Two trains having equal lengths, take 10 seconds and 15 seconds respectively to cross a post. If the length of each train is 120 meters, in what time (in seconds) will they cross each other when traveling in opposite direction? A train passes a platform in 36 seconds. The same train passes a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr, The length of the platform is