A square measuring $1$m$1$m by $1$m$1$m is moving away from observer A along a direction parallel to one of its sides at a speed such that is equal to $2.$ To an observer moving along with the square, the time interval between consecutive blinks of her eyes is $1$s$1$s$.$

Part A

To the stationary observer A$,$ this time interval is

$2$s$2$s$\mathrm{.}1$s$1$s$\mathrm{.}12$s$12$s$\mathrm{.}14$s$14$s$.$