Answer
Ellie's race time is $8+t$.
Work Step by Step
Ellie's race time is 5 seconds longer than Dion's, so
$e=5+d$
Dion's race time is 3 seconds longer than Molly's and Molly's race time is $t$, so
$d=3+t$
Substitute for $d$ to find Ellie's race time in terms of $t$.
$e=5+d=5+3+t=8+t$
