how many seconds will a train 100 meters long take to cross a bridge 150 meters long if the speed of the train is 54 kmph ?
"d = 100 + 150 = 250 s = 54 * 5 / 18 = 15 mps t = 250 / 15 = 16.7 sec answer : c"
divide(add(150, 100), multiply(54, const_0_2778))