Your answer is partially correct.

Two particles oscillate in simple harmonic motion along a common straight$-$line segment of length $1\mathrm{.}7$ m $.$ Each particle has a period of $2\mathrm{.}4$ s $,$ but they differ in phase by $\frac{}{8}$rad. $($a$)$ How far apart are they $0\mathrm{.}82$ s after the lagging particle leaves one end of the path? $($b$)$ Are they then moving in the same direction, toward each other, or away from each other?

$($a$)$ Number $$ Units

$($b$)$