Train A passes a lamp post in 9 seconds and 700 meter long platfrom in 30 seconds. How much time will the same train take to cross a platfrom which is 800 meters long? (in seconds)

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Answer:- 1
Explanation:-

Solution:
Let the length of train be x mWhen a train crosses a light post in 9 second the distance covered = length of train speed of train = x9Distance covered in crossing a700 meter platfrom in 30 seconds = Length of platfrom + length of trainSpeed of train = x+7009x9=x+70030[Speed = DistanceTime]x3=x+7001010x=3x+210010x3x=21007x=2100x=21007=300mWhen the length of the platform be 800m,then time T be taken by train to cross 800mlong platfromx9=x+800TTx=9x+7200300T=2700+7200300T=9900T=9900300=33 seconds

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", "dateCreated": "7/24/2019 10:09:12 AM", "author": { "@type": "Person", "name": "Nitin Sir" } }, "suggestedAnswer": { "@type": "Answer", "text": "
Solution:
Let the length of train be x mWhen a train crosses a light post in 9 second the distance covered = length of train speed of train = x9Distance covered in crossing a700 meter platfrom in 30 seconds = Length of platfrom + length of trainSpeed of train = x+7009x9=x+70030[Speed = DistanceTime]x3=x+7001010x=3x+210010x3x=21007x=2100x=21007=300mWhen the length of the platform be 800m,then time T be taken by train to cross 800mlong platfromx9=x+800TTx=9x+7200300T=2700+7200300T=9900T=9900300=33 seconds
", "dateCreated": "7/24/2019 10:09:12 AM" } }
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