Book Maths Puzzle

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

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Book Other Question

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? Two trains are moving in opposite directions with speed of 60 km/hr and 90 km/hr respectively. Their lengths are 1.10 km and 0.9 km respectively. the slower train cross the faster train in --- seconds