a train of length 250 m crosses a bridge of length 150 m in 25 seconds . what is the speed of train ?
sol : ( length of train + length of bridge ) = speed of train x time ( 250 + 150 ) = 25 x speed speed = 400 / 25 = 16 m / s = 57.6 km / h answer = a
multiply(const_3_6, divide(add(250, 150), 25))