If  $P (1+\raisebox{1ex}{$t$}\!\left/ \!\raisebox{-1ex}{$\sqrt{2}$}\right.,2+\raisebox{1ex}{$t$}\!\left/ \!\raisebox{-1ex}{$\sqrt{2}$}\right.)$ be any point on a line then the range of values of t for  which the point P lies between the parallel lines

$x+2y=1 and 2x+4y=15$is