a 415 m long train is running at 63 km / hr . in how much time will it cross a tunnel 285 m long ?
"speed of the train = ( 63 * 5 / 18 ) m / sec = 35 / 2 m / sec . distance travelled = ( speed x time ) time = ( distance travelled / speed ) distance travelled = length of the train + length of the tunnel = 415 + 285 = 700 m time = ( 700 / 35 / 2 ) = 40 sec answer : e"
divide(add(415, 285), multiply(63, const_0_2778))