a ship going at the speed of 18 km / hr crosses a light house in 20 seconds . what is the length of the train ?
speed = ( 18 x 5 / 18 ) = 5 m / sec . length of the train = ( speed x time ) . length of the train = 5 x 20 m = 100 m . answer : c
multiply(multiply(18, const_0_2778), 20)