Q-7.A train 400m long is running at a speed of 72km/hr.How much time does it take to cross a telegraph post? please help fast!

Length of the train = 400 m
Speed of the train = 72 km/hr = 72×100060×60 = 20 m/s
So, time taken to cross a telegraph post = length of the trainspeed of the train  = 40020 = 20 s
Therefore, it takes 20 second to cross a telegraph post.

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