the length of the bridge , which a train 475 metres long and travelling at 90 km / hr can cross in 30 seconds , is :
"speed = [ 90 x 5 / 18 ] m / sec = [ 25 ] m / sec time = 30 sec let the length of bridge be x metres . then , ( 475 + x ) / 30 = 25 = > 475 + x = 750 = > x = 275 answer : e"
subtract(multiply(divide(multiply(90, speed(const_1000, const_1)), speed(const_3600, const_1)), 30), 475)