a train 360 m long runs with a speed of 45 km / hr . what time will it take to pass a platform of 130 m long ?
"speed = 45 km / hr = 45 ã — ( 5 / 18 ) m / s = 150 / 12 = 50 / 4 = 25 / 2 m / s total distance = length of the train + length of the platform = 360 + 130 = 490 meter time taken to cross the platform = 490 / ( 25 / 2 ) = 490 ã — 2 / 25 = 39.2 seconds answer : a"
multiply(divide(add(divide(130, const_1000), divide(360, const_1000)), 45), const_3600)