Question

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Answer 1

what are you telling not understand

Answer 2

Answer:

See,

Length of the train = 120m

Length of the platform which is needed to cross = 130m

Speed given of the train = 50km/hr

So, if we want train to cross the whole platform , then it should complete the distance of platform plus it's own length,

i.e. Total length to be covered = 120m +130m = 250m = 0.25KM

So now,

Speed given to you ,

Distance to be covered given above ,

Then using formula ,

Speed = Distance/Time

=> TIME = DISTANCE/SPEED

=>Time = .25km/(50km/hr)

=>Time = .005 hr

=> Time = .005*3600sec = 18sec

So, Total time taken by a 120m train to cross the platform of 130m is 18sec.