a 140 m long train is running at a speed of 55 km / hr . it crossed a platform of length 520 m in ?
speed = 55 km / hr ( to convert km / hr in to m / s ) = 55 x 5 / 18 m / s distance = 140 m + 520 m ( if questions is about train crossing a post you need to consider only the length of train , ) = 660 m time = distance / speed = 660 x 18 / ( 5 x 55 ) = 43.2 sec ans is : d
divide(add(140, 520), multiply(55, const_0_2778))