a train travelling at 72km/h crosses a man in 20second . find the length of train. pls answer

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AnswerSpeed of the train in metres/sec = 72000/3600 = 20Speed of the train in metres/sec = 72000/3600 = 20Distance travelled by train to cross the platform = 30 * 20 = 600 = Length of train + Length of platformSpeed of the train in metres/sec = 72000/3600 = 20Distance travelled by train to cross the platform = 30 * 20 = 600 = Length of train + Length of platformDistance travelled by train to cross the man = 18 * 20 = 360 = Length of trainSpeed of the train in metres/sec = 72000/3600 = 20Distance travelled by train to cross the platform = 30 * 20 = 600 = Length of train + Length of platformDistance travelled by train to cross the man = 18 * 20 = 360 = Length of trainLength of platform = 600 – 360 = 240MarkbrainlistandgivethanksAnswer:400 m.

Step-by-step explanation:When trains cross pole or man, distance = length of train.

Given:

Speed = 72 km/h = 72 × 5/18 = 4 × 5 = 20 m/s

Time = 20 s

Distance = Length = Speed × Time = 20 × 20 = 400 m.

Therefore the length of train is 400 m.