how long does a bus 100 m long traveling at 50 kmph takes to cross a bridge of 150 m in length ?
d = 100 + 150 = 250 m s = 50 * 5 / 18 = 125 / 9 t = 250 * 9 / 125 = 18 sec answer : a
divide(add(150, 100), speed(50, const_3_6))