A train requires 7 seconds to pass a pole while it requires 25 seconds to cross a station platform
which is 378 meters long. Find the speed of the train.
(a) 75.6 kmph (b) 75.4 kmph (c) 76.2 kmph (d) 21 kmph

Hi friend the answer for this is option a.
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Train require 25sec to cross 378m + its own lenght
Hence it take 7 sec to cover its own lenght
So 25-7 = 18 sec to cross platform only
So 378/18= 21m/sec is its speed
You can convert it also 75.6 km/hr
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