if i walk at 3kmph, I miss the train by 2mins, if however i walk at 4kmph, i reach the station 2mins before the arrival of the train. how far do I walk to reach the station?
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difference in time will 2+2=4 min ,
which is equal to 4/60=1/15hr
therefore
dis/3km/hr - dis/4km/hr =1/15,
dis=4/5km
which is equal to 800 m. (answer)
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