Question

Train travelling at a speed of 54 km/h takes 12 seconds to cross a man standing
on a railway
platform. Find the length of the train. Hence find the time taken by the train to cross a bridge
0.255 km long .
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Answer 1

Step-by-step explanation:

Answer

Length of train = Distance covered in 12s

=(speed×times)12s

=

3600

54×1000

×12=180 m

Answer 2

Step-by-step explanation:

54km/h = 54000/3600 m/s = 15m/s

Time to cross pole =11 s

Hence length of train = v×t = 15× 11= 165 m

Time taken to cross platform = ( Length of platform+ length of train)/v = 165+240)/15 = 405/15 = 27 Second.