how long does a train 100 m long traveling at 72 kmph takes to cross a tunnel of 1400 m in length ?
d = 1400 + 100 = 1500 m s = 72 * 5 / 18 = 20 t = 1500 * 1 / 20 = 75 sec answer : d
divide(add(100, 1400), multiply(72, const_0_2778))